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<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="UTF-8"><meta name="copyright" content="(C) Copyright 2022"><meta name="DC.rights.owner" content="(C) Copyright 2022"><meta name="DC.type" content="reference"><meta name="prodname" content="All units with FXS ports"><meta name="version" content="DGW 4849.50.27182809"><meta name="platform" content="41xx"><meta name="DC.date.modified" content="2022-0511-0410"><meta name="DC.date.issued" content="2022-0511-0410"><meta name="DC.date.available" content="2022-0511-0410"><meta name="ChapterNumbering" content="no"><meta name="DC.format" content="HTML5"><meta name="DC.identifier" content="reference_mcd_ysk_zt"><link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet"><link rel="stylesheet" type="text/css" href="https://documentation.media5corp.com/download/attachments/45482024/commonltr.css"><link rel="stylesheet" type="text/css" href="https://documentation.media5corp.com/download/attachments/45482024/custom.css"><title>Standard Fax Configuration</title></head><body><header role="banner"><div class="topicmeta title">Standard Fax Configuration</div><div class="topicmeta date">2022-0511-04<10</div><div class="topicmeta product">All units with FXS ports</div><div class="topicmeta version">DGW 4849.50.2718<2809</div><div class="topicmeta pdf"><a href="https://documentation.media5corp.com/download/attachments/45482024/Standard%20Fax%20Configuration.pdf" rel="nofollow">Download PDF Document</a></div><hr><span style="float: inline-end;"></span></header><nav role="toc"><ul><li><a href="#reference_mcd_ysk_zt">Fax Information Required for Troubleshooting</a></li><li><a href="#reference_hdg_kfk_zt">T.38 Fax Transmission</a><ul><li><a href="#task_w2w_wfm_zt">Enabling T.38 Fax Transmission</a></li><li><a href="#task_yss_jnk_zt">Setting the Redundancy Level</a></li><li><a href="#task_g5h_zmt_lt">Allowing Unsecure T.38 with Secure RTP</a></li><li><a href="#task_wr1_pvb_nt">Selecting the Base Port for T.38 Fax Calls</a></li><li><a href="#task_kmc_3pb_nt">Configuring the Behavior of the T.38 INVITE Not Accepted</a></li></ul></li><li><a href="#reference_nxc_hkk_zt">Fax Transmission through a Firewall</a><ul><li><a href="#task_ehr_tkt_lt">Configuring the T.38 No Signal</a></li></ul></li><li><a href="#reference_ewm_ygk_zt">Clear Channel Fax Transmission</a><ul><li><a href="#task_zsp_1rk_zt">Configuring the Clear Channel Fax Transmission</a></li></ul></li><li><a href="#reference_gh3_pcm_zt">FAX Detection Flow</a><ul><li><a href="#task_ks2_fqt_lt">Configuring Machine Detection</a></li></ul></li><li><a href="#concept_vtd_gkg_yr">Parameters</a><ul><li><a href="#reference_spw_vhc_nt">SipEp > Interop Parameters </a></li></ul></li><li><a href="#reference_j4g_nbv_gfb">Online Help</a></li><li><a href="#concept_v4k_q3h_1r">DGW Documentation</a></li><li><a href="#concept_fqm_rv4_k4">Copyright Notice</a></li></ul></nav><main role="main"><article role="article" aria-labelledby="ariaid-title1"><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="nested0" aria-labelledby="ariaid-title1" id="reference_mcd_ysk_zt">
<h1 class="title topictitle1" id="ariaid-title1">Fax Information Required for Troubleshooting</h1>
<div class="body refbody">
<table class="table frame-all" id="reference_mcd_ysk_zt__table_s3k_zsk_zt"><caption></caption><colgroup><col style="width:33.33333333333333%"><col style="width:33.33333333333333%"><col style="width:33.33333333333333%"></colgroup><thead class="thead">
<tr class="row">
<th class="entry colsep-1 rowsep-1" id="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Information</th>
<th class="entry colsep-1 rowsep-1" id="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="2">Type</th>
</tr>
</thead><tbody class="tbody">
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Fax Transmission Protocol </td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Clear Mode</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">T.38</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Fax Transmission Speed </td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">High speed</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Low speed</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Fax mode</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Automatic</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Manual</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Receiving fax </td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Model</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Make </td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Sending fax </td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Model</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Make</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Fax mode </td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">ECM</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">non- ECM</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1">Firewall</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">Yes</td>
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2">No</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__1 reference_mcd_ysk_zt__table_s3k_zsk_zt__entry__2" colspan="3"></td>
</tr>
</tbody></table>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested0" aria-labelledby="ariaid-title2" id="reference_hdg_kfk_zt">
<h1 class="title topictitle1" id="ariaid-title2">T.38 Fax Transmission</h1>
<div class="body refbody"><p class="shortdesc">T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real
time. </p>
<section class="section"><h2 class="title sectiontitle">PROs</h2>
</section>
<section class="section">
<ul class="ul" id="reference_hdg_kfk_zt__ul_kpc_tgk_zt">
<li class="li">Allows for redundancy, therefore increases the reliability of the transmissions.</li>
<li class="li">Faxes in T.38 are not as sensitive to network imperfection like packet loss or jitter as
faxes in Clear Channel. </li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">CONs</h2>
</section>
<section class="section">
<ul class="ul" id="reference_hdg_kfk_zt__ul_gk5_5gk_zt">
<li class="li">The number of redundancy packets will increase the bandwidth used</li>
<li class="li">The higher the speed, the more bandwidth is used.</li>
<li class="li">May take more bandwidth than a fax in Clear channel. </li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">Requirements </h2>
</section>
<section class="section">
<ul class="ul" id="reference_hdg_kfk_zt__ul_zm1_pvl_zt">
<li class="li">The Mediatrix must be able to detect a CNG , v21 preamble or T.38 packet to switch to
T.38 </li>
<li class="li">Reasonable delay, 1 second round trip is acceptable however 2 seconds could cause
timeout or collision </li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">Configuration </h2>
</section>
<section class="section">
<ul class="ul" id="reference_hdg_kfk_zt__ul_l3c_3nk_zt">
<li class="li"><a class="xref" href="#task_w2w_wfm_zt">Enabling T.38 Fax Transmission</a></li>
<li class="li"><a class="xref" href="#task_yss_jnk_zt">Setting the Redundancy Level</a>
</li>
<li class="li"><a class="xref" href="#task_g5h_zmt_lt">Allowing Unsecure T.38 with Secure RTP</a></li>
<li class="li"><a class="xref" href="#task_wr1_pvb_nt">Selecting the Base Port for T.38 Fax Calls</a></li>
<li class="li"><a class="xref" href="#task_kmc_3pb_nt" title="This task allows you to set the unit’s behaviour after receiving an error to a SIP INVITE for T.38 fax.">Configuring the Behavior of the T.38 INVITE Not Accepted</a></li>
</ul>
</section>
<section class="section">Call Flow <br><img class="image" id="reference_hdg_kfk_zt__image_r2v_2kk_zt" src="https://documentation.media5corp.com/download/attachments/45482024/T38FaxCallFlow.png" width="500"><br></section>
</div>
<hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title3" id="task_w2w_wfm_zt">
<h2 class="title topictitle2" id="ariaid-title3">Enabling T.38 Fax Transmission</h2>
<div class="body taskbody">
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step">
<span class="ph cmd"> Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Codecs</span>. </span>
</li><li class="li step">
<span class="ph cmd">In the <span class="keyword wintitle">Codec</span> section,
click <img class="image" id="task_w2w_wfm_zt__image_avg_m4k_zt" src="https://documentation.media5corp.com/download/attachments/45482024/pencilbleu.jpg" width="14"> located on the same line as <span class="ph uicontrol">T.38</span>.</span>
</li><li class="li step">
<span class="ph cmd">Set the <span class="keyword wintitle">Enable</span> filed
to <span class="keyword wintitle">Enable</span>. </span>
</li><li class="li step">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_w2w_wfm_zt__image_djv_kgm_zt" src="https://documentation.media5corp.com/download/attachments/45482024/T38.png" width="800"><br>
</section>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title4" id="task_yss_jnk_zt">
<h2 class="title topictitle2" id="ariaid-title4">Setting the Redundancy Level</h2>
<div class="body taskbody">
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step stepexpand">
<span class="ph cmd"> Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Codecs</span>. </span>
</li><li class="li step stepexpand">
<span class="ph cmd">In the <span class="keyword wintitle">Codec</span> section,
click <img class="image" id="task_yss_jnk_zt__image_avg_m4k_zt" src="https://documentation.media5corp.com/download/attachments/45482024/pencilbleu.jpg" width="14"> located on the same line as <span class="ph uicontrol">T.38</span>.</span>
</li><li class="li step stepexpand">
<span class="ph cmd">In the <span class="ph uicontrol">T.38</span> table,
set the <span class="ph uicontrol">Redundancy Level </span>.</span>
<div class="itemgroup info">
<div class="note note note_note"><span class="note__title">Note:</span> Using redundancy increases transmission reliability, however the number of
redundancy packets will also increase the bandwidth being used.</div>
</div>
</li><li class="li step stepexpand">
<span class="ph cmd">Set the <span class="keyword wintitle">Frame Redundancy Level</span>. </span>
<div class="itemgroup info">
<div class="note note note_note"><span class="note__title">Note:</span> The repetition of the final frame will help prevent losing the end of a
message, v.21 or end of page message. Losing the end of packet message can
create a major problem in the transmission since the Redundancy is not use
in this situation.</div>
</div>
</li><li class="li step stepexpand">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_yss_jnk_zt__image_itp_mxl_zt" src="https://documentation.media5corp.com/download/attachments/45482024/T38.png" width="800"><br>
</section>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title5" id="task_g5h_zmt_lt">
<h2 class="title topictitle2" id="ariaid-title5">Allowing Unsecure T.38 with Secure RTP</h2>
<div class="body taskbody">
<section class="section context"><div class="tasklabel"><strong class="sectiontitle tasklabel">Context</strong></div><p class="p">The T.38 protocol must be enabled under <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Codec</span>.</p>This procedure is
required only if SRTP is used and is available provided the <span class="keyword wintitle">Select Endpoint</span> selection list is set
to <span class="keyword wintitle">Default</span>.</section>
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step">
<span class="ph cmd">Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Security</span>.</span>
</li><li class="li step">
<span class="ph cmd">In the <span class="keyword wintitle">Security</span>
table, under the <span class="keyword wintitle">RTP</span>
section, set the <span class="keyword wintitle">Mode</span>
selection list to <span class="keyword wintitle">Secure with fallback</span>.</span>
</li><li class="li step">
<span class="ph cmd"> Under the <span class="ph uicontrol">T.38</span>
section, set the <span class="keyword wintitle">Allow Unsecure T.38 with Secure RTP</span> selection list to <span class="keyword wintitle">Yes</span>. </span>
</li><li class="li step">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_g5h_zmt_lt__image_egd_pmy_lt" src="https://documentation.media5corp.com/download/attachments/45482024/UnsecuredT38.png"><br>
</section>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title6" id="task_wr1_pvb_nt">
<h2 class="title topictitle2" id="ariaid-title6">Selecting the Base Port for T.38 Fax Calls</h2>
<div class="body taskbody">
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step stepexpand">
<span class="ph cmd">Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Misc</span>.</span>
</li><li class="li step stepexpand">
<span class="ph cmd">In the <span class="keyword wintitle">Base Port</span>
table, enter the first port to be used for T.38 Fax calls in the <span class="ph uicontrol">T.38</span> field.</span>
<div class="itemgroup info">
<div class="note note note_note"><span class="note__title">Note:</span> If you do not know which port to use, refer to the <a class="xref" href="https://documentation.media5corp.com/display/DGWLATEST/Ports+and+Protocol+Settings" target="_blank">Technical Bulletin - Ports and Protocol
Settings</a> published on the <a class="xref" href="https://documentation.media5corp.com/" target="_blank">Media5 Documentation Portal</a>.
</div>
</div>
</li><li class="li step stepexpand">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_wr1_pvb_nt__image_p2l_1bc_nt" src="https://documentation.media5corp.com/download/attachments/45482024/BasePorts.png" width="800"><br>
</section>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title7" id="task_kmc_3pb_nt">
<h2 class="title topictitle2" id="ariaid-title7">Configuring the Behavior of the T.38 INVITE Not Accepted</h2>
<div class="body taskbody"><p class="shortdesc">This task allows you to set the unit’s behaviour after receiving an error to a SIP
INVITE for T.38 fax. </p>
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step">
<span class="ph cmd">Go to <span class="keyword wintitle">SIP</span>/<span class="keyword wintitle">Interop</span>. </span>
</li><li class="li step">
<span class="ph cmd">In the <span class="keyword wintitle">Behavior on T.38 INVITE Not
Accepted</span> table, from the <span class="keyword wintitle">Behavior</span> selection list, set
the required behavior for each <span class="keyword wintitle">SIP Error Code</span>.</span>
</li><li class="li step">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_kmc_3pb_nt__image_jkg_qqp_hz" src="https://documentation.media5corp.com/download/attachments/45482024/BehavioronT38InviteNotAccepted.png" width="800"><br>
</section>
</div>
</article></article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested0" aria-labelledby="ariaid-title8" id="reference_nxc_hkk_zt">
<h1 class="title topictitle1" id="ariaid-title8">Fax Transmission through a Firewall</h1>
<div class="body refbody"><p class="shortdesc">Using T.38 with a Firewall</p>
<section class="section"><h2 class="title sectiontitle">Requirements</h2>
</section>
<section class="section">
<ul class="ul" id="reference_nxc_hkk_zt__ul_hv4_4kk_zt">
<li class="li">The communication channel must remain open for a fax to go through a firewall i.e. the
unit sends "no signal" packets to fill the dead air intervals that could occur during a
fax transmission and cause the closure of the firewall. </li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">Configuration </h2>
</section>
<section class="section">
<ul class="ul" id="reference_nxc_hkk_zt__ul_ozk_bpk_zt">
<li class="li"><a class="xref" href="#task_ehr_tkt_lt">Configuring the T.38 No Signal</a></li>
</ul>
</section>
</div>
<hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title9" id="task_ehr_tkt_lt">
<h2 class="title topictitle2" id="ariaid-title9">Configuring the T.38 No Signal</h2>
<div class="body taskbody">
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step stepexpand">
<span class="ph cmd">Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Codecs</span>.</span>
</li><li class="li step stepexpand">
<span class="ph cmd">Click <img class="image" id="task_ehr_tkt_lt__image_nkd_klt_lt" src="https://documentation.media5corp.com/download/attachments/45482024/pencilbleu.jpg" width="14"> located on the same row as <span class="ph uicontrol">T.38</span>.</span>
</li><li class="li step stepexpand">
<span class="ph cmd">Set the <span class="keyword wintitle">No Signal</span>
selection list to <span class="keyword wintitle">Enable</span>.</span>
</li><li class="li step stepexpand">
<span class="ph cmd">Set the <span class="keyword wintitle">No Signal Timeout</span> selection list to <span class="keyword wintitle">Enable</span>.</span>
<div class="itemgroup info">
<div class="note note note_note"><span class="note__title">Note:</span> In order to keep RTP ports opened for T.38 packets, the unit will send 'no
signal' packets to fill the dead air intervals that could occur during a fax
transmission and cause the closure of the firewall.</div>
</div>
</li><li class="li step stepexpand">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_ehr_tkt_lt__image_fwk_1ny_lt" src="https://documentation.media5corp.com/download/attachments/45482024/T38.png" width="600"><br>
</section>
</div>
</article></article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested0" aria-labelledby="ariaid-title10" id="reference_ewm_ygk_zt">
<h1 class="title topictitle1" id="ariaid-title10">Clear Channel Fax Transmission</h1>
<div class="body refbody"><p class="shortdesc">Modulated Fax information from the PSTN is passed in-band end-to-end over a voice
speech path in a IP network. </p>
<section class="section">There are 2 pass-through techniques.<ul class="ul" id="reference_ewm_ygk_zt__ul_rl1_v3k_zt">
<li class="li">The configured voice codec is used for fax transmission. This technique works only when
the configured codec is G711 with no VAD and no echo cancellation (EC) or when the
configured codec is a clear channel codec or G.726/32. Low bit-rate codecs cannot be used
for fax transmission.</li>
<li class="li">Gateway dynamically changes the codec from the codec configured for voice to G.711 with
no VAD and no EC for the duration of the fax session. This method is referred to as "codec
up speed" or "fax pass-through with up speed".</li>
</ul></section>
<section class="section"><h2 class="title sectiontitle">PROs</h2>
</section>
<section class="section">
<ul class="ul" id="reference_ewm_ygk_zt__ul_kpc_tgk_zt">
<li class="li">Less intrusive, does not modify the packets</li>
<li class="li">Does not allows for redundancy</li>
<li class="li">Takes less bandwidth than a T.38 fax transmission</li>
<li class="li">The bandwidth usage is practically constant. </li>
<li class="li">Bandwidth only affected by the P-Time. </li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">CONs</h2>
</section>
<section class="section">
<ul class="ul" id="reference_ewm_ygk_zt__ul_gk5_5gk_zt">
<li class="li">Sensitive to network imperfection like packet loss or jitter</li>
</ul>
</section>
<section class="section"><h2 class="title sectiontitle">Configuration</h2>
</section>
<section class="section"><a class="xref" href="#task_zsp_1rk_zt">Configuring the Clear Channel Fax Transmission</a></section>
<section class="section">Call Flow <br><img class="image" id="reference_ewm_ygk_zt__image_sp5_fkk_zt" src="https://documentation.media5corp.com/download/attachments/45482024/ClearModeFaxCallFlow.png" width="800"><br></section>
</div>
<hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title11" id="task_zsp_1rk_zt">
<h2 class="title topictitle2" id="ariaid-title11">Configuring the Clear Channel Fax Transmission</h2>
<div class="body taskbody">
<section id="task_zsp_1rk_zt__steps_ag5_drk_zt"><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps" id="task_zsp_1rk_zt__steps_ag5_drk_zt"><li class="li step">
<span class="ph cmd"> Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Codecs</span>. </span>
</li><li class="li step">
<span class="ph cmd">In the <span class="keyword wintitle">Codec</span> section,
click <img class="image" id="task_zsp_1rk_zt__image_wkp_hrk_zt" src="https://documentation.media5corp.com/download/attachments/45482024/pencilbleu.jpg"> located
on the same line as the Codec you wish to use for Fax Transmission.</span>
</li><li class="li step">
<span class="ph cmd">In the selected Codec table, set the fields as required.</span>
</li><li class="li step">
<span class="ph cmd">Make sure to enable the <span class="keyword wintitle">Data Transmission</span>.</span>
</li><li class="li step">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>.</span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>For example:<br><img class="image" id="task_zsp_1rk_zt__image_xvt_d1m_zt" src="https://documentation.media5corp.com/download/attachments/45482024/ClearMode.png" width="800"><br></section>
</div>
</article></article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested0" aria-labelledby="ariaid-title12" id="reference_gh3_pcm_zt">
<h1 class="title topictitle1" id="ariaid-title12">FAX Detection Flow</h1>
<div class="body refbody">
<table class="table frame-all" id="reference_gh3_pcm_zt__table_t3c_qcm_zt"><caption></caption><colgroup><col style="width:33.33333333333333%"><col style="width:33.33333333333333%"><col style="width:33.33333333333333%"></colgroup><thead class="thead">
<tr class="row">
<th class="entry colsep-1 rowsep-1" id="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__1">IF </th>
<th class="entry colsep-1 rowsep-1" id="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__2">AND</th>
<th class="entry colsep-1 rowsep-1" id="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__3">THEN </th>
</tr>
</thead><tbody class="tbody">
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__1">If T.38 is enabled </td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__2">
<ul class="ul" id="reference_gh3_pcm_zt__ul_skv_tcm_zt">
<li class="li">A CNG tone is detected, or</li>
<li class="li">A V.21 preamble is detected, or</li>
<li class="li"> T.38 packets are received on the IP side</li>
</ul>
</td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__3">Then the Mediatrix switches to T.38</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__1">
<ul class="ul" id="reference_gh3_pcm_zt__ul_bsb_xcm_zt">
<li class="li">If a CED tone is detected (Answer Tone or ANS) and no other conditions indicates
that a fax is present, or </li>
<li class="li">If a fax is detected but T.38 is deactivated </li>
</ul>
</td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__2"></td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__3">Then the Mediatrix unit switches to Clear mode.</td>
</tr>
<tr class="row">
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__1">If a CED <div class="note note note_note"><span class="note__title">Note:</span> Note that the CED tone can be detected on both the IP side (egress
side) or on the analog side (ingress side). is detected before a CNG</div></td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__2"></td>
<td class="entry colsep-1 rowsep-1" headers="reference_gh3_pcm_zt__table_t3c_qcm_zt__entry__3">The Mediatrix unit will first switch to Clear Channel and if T.38 is enabled, it
will then switch to T.38. </td>
</tr>
</tbody></table>
</div>
<hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic task nested1" aria-labelledby="ariaid-title13" id="task_ks2_fqt_lt">
<h2 class="title topictitle2" id="ariaid-title13">Configuring Machine Detection</h2>
<div class="body taskbody">
<section class="section context"><div class="tasklabel"><strong class="sectiontitle tasklabel">Context</strong></div><div class="note note note_note"><span class="note__title">Note:</span> This
procedure is only required if your fax machine is directly connected to a specific
FXS port and if this port is not used for modem transmission.</div></section>
<section><div class="tasklabel"><strong class="sectiontitle tasklabel">Steps</strong></div><ol class="ol steps"><li class="li step">
<span class="ph cmd">Go to <span class="keyword wintitle">Media</span>/<span class="keyword wintitle">Misc</span>. </span>
</li><li class="li step">
<span class="ph cmd">Set the <span class="keyword wintitle">CNG Tone Detection</span> selection
list to <span class="keyword wintitle">Enable</span>.</span>
</li><li class="li step">
<span class="ph cmd">Set the <span class="keyword wintitle">CED Tone Detection</span> selection
list to <span class="keyword wintitle">Enable</span>. </span>
</li><li class="li step">
<span class="ph cmd">Set the <span class="keyword wintitle">V.21 Modulation Detection</span>
selection list to <span class="keyword wintitle">Enable</span>.</span>
</li><li class="li step">
<span class="ph cmd">Set the <span class="keyword wintitle">Behavior On CED Tone
Detection</span>
selection list to <span class="keyword wintitle">Fax Mode</span>.</span>
</li><li class="li step">
<span class="ph cmd">Click <span class="keyword wintitle">Apply</span>. </span>
</li></ol></section>
<section class="section result"><div class="tasklabel"><strong class="sectiontitle tasklabel">Result</strong></div>
<br><img class="image" id="task_ks2_fqt_lt__image_ozz_gny_lt" src="https://documentation.media5corp.com/download/attachments/45482024/MachineDetection.png" width="600"><br>
</section>
</div>
</article></article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic concept nested0" aria-labelledby="ariaid-title14" id="concept_vtd_gkg_yr">
<h1 class="title topictitle1" id="ariaid-title14">Parameters</h1>
<div class="body conbody">
<div class="p">Although the services can be configured in great part in the web browser, some aspects of the
configuration can only be completed with the MIB parameters by:<ul class="ul" id="concept_vtd_gkg_yr__ul_gfn_14v_wr">
<li class="li">using a MIB browser, such as the Mediatrix Unit Manager Network (UMN);</li>
<li class="li">using the CLI;</li>
<li class="li">creating a configuration script containing the configuration parameters.</li>
</ul></div>
</div>
<hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested1" aria-labelledby="ariaid-title15" id="reference_spw_vhc_nt">
<h2 class="title topictitle2" id="ariaid-title15">SipEp > Interop Parameters </h2>
<div class="body refbody">
<section class="section">REfer to the SipEp.InteropSdpT38ParametersEncoding parameter in the <a class="xref" href="https://documentation.media5corp.com/display/DGWLATEST/Reference+Guide" target="_blank">DGW Configuration Guide - Reference Guide</a> published on the <a class="xref" href="https://documentation.media5corp.com/" target="_blank">Media5 Documentation Portal</a>.</section>
</div>
</article></article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic reference nested0" aria-labelledby="ariaid-title16" id="reference_j4g_nbv_gfb">
<h1 class="title topictitle1" id="ariaid-title16">Online Help</h1>
<p class="shortdesc"><span class="ph">If you are not familiar with the meaning of the fields and
buttons, click <span class="keyword wintitle">Show Help</span>, located at the upper right corner of
the Web page. When activated, the fields and buttons that offer online help will
change to green and if you hover over them, the description will bedisplayed.</span></p>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic concept nested0" aria-labelledby="ariaid-title17" id="concept_v4k_q3h_1r">
<h1 class="title topictitle1" id="ariaid-title17">DGW Documentation</h1>
<div class="body conbody"><p class="shortdesc">Mediatrix devices are supplied with an exhaustive set of documentation. </p>
<p class="p">Mediatrix user documentation is available on the <a class="xref" href="http://documentation.media5corp.com" target="_blank">Media5 Documentation
Portal</a>.</p>
<div class="p">Several types of documents were created to clearly present the information you are looking for.
Our documentation includes:<ul class="ul" id="concept_v4k_q3h_1r__ul_bqy_cjh_1r">
<li class="li"><strong class="ph b">Release notes</strong>: Generated at each GA release, this document includes the known and
solved issues of the software. It also outlines the changes and the new features the release
includes.</li>
<li class="li"><strong class="ph b">Configuration notes</strong>: These documents are created to facilitate the configuration of a
specific use case. They address a configuration aspect we consider that most users will need to
perform. However, in some cases, a configuration note is created after receiving a question
from a customer. They provide standard step-by-step procedures detailing the values of the
parameters to use. They provide a means of validation and present some conceptual information.
The configuration notes are specifically created to guide the user through an aspect of the
configuration. </li>
<li class="li"><strong class="ph b">Technical bulletins</strong>: These documents are created to facilitate the configuration of a
specific technical action, such as performing a firmware upgrade.</li>
<li class="li"><strong class="ph b">Hardware installation guide</strong>: They provide the detailed procedure on how to safely and
adequately install the unit. It provides information on card installation, cable connections,
and how to access for the first time the Management interface.</li>
<li class="li"><strong class="ph b">User guide</strong>: The user guide explains how to customise to your needs the configuration
of the unit. Although this document is task oriented, it provides conceptual information to
help the user understand the purpose and impact of each task. The User Guide will provide
information such as where and how TR-069 can be configured in the Management Interface, how to
set firewalls, or how to use the CLI to configure parameters that are not available in the
Management Interface.</li>
<li class="li"><strong class="ph b">Reference guide</strong>: This exhaustive document has been created for advanced users. It
includes a description of all the parameters used by all the services of the Mediatrix units.
You will find, for example, scripts to configure a specific parameter, notification messages
sent by a service, or an action description used to create Rulesets. This document includes
reference information such as a dictionary, and it does not include any step-by-step
procedures. </li>
</ul></div>
</div>
</article><hr><span style="float: inline-end;"><a href="#">Top</a></span><article class="topic concept nested0" aria-labelledby="ariaid-title18" id="concept_fqm_rv4_k4">
<h1 class="title topictitle1" id="ariaid-title18">Copyright Notice</h1>
<div class="body conbody"><p class="shortdesc">Copyright © 2022 Media5 Corporation.</p>
<p class="p">This document contains information that is proprietary to Media5 Corporation.</p>
<p class="p">Media5 Corporation reserves all rights to this document as well as to the Intellectual Property
of the document and the technology and know-how that it includes and represents.</p>
<p class="p">This publication cannot be reproduced, neither in whole nor in part, in any form whatsoever,
without written prior approval by Media5 Corporation.</p>
<p class="p">Media5 Corporation reserves the right to revise this publication and make changes at any time
and without the obligation to notify any person and/or entity of such revisions and/or
changes.</p>
</div>
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