The PCM traces are two different RTP streams made specifically to record all analog or digital signals that are either sent or received by the telephony ports of the Mediatrix unit.
These RTP streams are sent to a configurable IP address, normally an IP address on your network where it can be recorded with a packet sniffer (such as Wireshark). Moreover, they are independent from the regular RTP streams of the VoIP call. On the analog devices, the streams are sent instantly at device start-up, with an average ptime of 5 ms. The resulting streams, depending on the model, are around 15 kB/s.
Only the configured port, port #1 and/or #2 send the PCM traces for a maximum of four simultaneous RTP streams.
All streams are sent instantly at start-up with an average ptime of 15 ms. This means that until the PCM traces are disabled, even an idle unit will continuously send up to 66.6 packets/s X 4 streams = 267 packets/s using approximately 174 bytes each, for a total of 46 Kbytes of upstream bandwidth.
On digital devices, the streams will be sent once a call is in process of being established (ISDN SETUP, SIP INVITE). This means no data will be sent if the gateway is idle with no calls in progress.
- Echo in the network
- DTMF signals
- Caller ID signals
- Fax signals (or false Fax detection)
- Message Waiting Indicator signals
- Any other analog signal
- Any voice quality issue
- RTP stream port 5001 is used for the PCM stream received from the peer.
- RTP stream port 6001 for the PCM stream sent to the peer.
- For 4400/S7/G7/C7 Series and Sentinel 100 and 400 test calls must be done on the configured port.
|4108/16/24||Port01 to Port24|
|4400||Bri1 to Bri4|
FXS1 to FXS8
FXO1 to FXO8
PRI1, PRI2, ...
FXS1, FXS2, ...
FXO1, FXO2, ...
Enabling the PCM Traces of a Port Using the CLI
If a port is receiving several calls at a time, the capture will be performed on the first call until it is completed, and only then will a capture be performed on another call. Traces are taken as soon as the port is opened.
Using the CLI, set the Mipt.PcmCaptureEnable parameter to
Note: For example Mipt.PcmCaptureEnable=Enable or Mipt.PcmCaptureEnable=1
Set the Mipt.PcmCaptureEndpoint parameter to the unit’s
endpoint on which the PCM capture will be taken from. For endpoint examples,
refer to Endpoint Examples.
Note: To make sure that you are capturing the appropriate endpoint, please verify its naming by running the following command in CLI: Epadm.Endpoint. The output of the command displays a table with the unit's endpoints.Note: For example Mipt.PcmCaptureEndpoint = FXO2Note: Port names are case sensitive.
Set the Mipt.PcmCaptureIpAddr MIB parameter to the IP
address of the PC running Wireshark.
Note: For example Mipt.PcmCaptureIpAddr = 192.168.0.17Note: This IP address does not have to be listening on UDP ports, as it is easy to filter out ICMP “port unreachable” messages afterwards.
When the capture is done, make sure to disable the
Mipt.PcmCaptureEnable MIB parameter.
Note: For example Mipt.PcmCaptureEnable = Disable or Mipt.PcmCaptureEnable = 0
Logging on to the Mediatrix Unit Web Interface
In your Web browser, enter the IP address at which the Web interface of your
Mediatrix unit can be reached.
- If your network has an IPv4 DHCP server, connect the primary Ethernet port of the Mediatrix unit to the network (ETH1 port), use the provided DHCP server IP address.
- You can also connect your computer to the secondary Ethernet port of the Mediatrix unit (ETH2), use the 192.168.0.10 IP address. However, the computer must also own an IP address in the 192.168.0.0/24 network.
Enter admin as your
username and administrator as the
Note: You can also use public as a username and leave the password field empty; it has the full administration rights by default.
- Click Login.
Restarting a Service - MIPT
- Go to System/Services.
- In the User Service table, locate the service Media IP Transport (MIPT).
- From the Startup Type selection list next to Media IP Transport (MIPT), choose Auto if you wish the service to start automatically when the system starts, or Manual to start to the service manually when needed.
- In the User Service table, click .
|Bri1-2||BRI port 1, channel 2|
|Slot2/E1T1-3||Channel 3 of the E1 port located in slot 2|
|Port09||Port 09 of a Mediatrix 4108-16-24 unit|
|Phone-Fax1||Port 1 of a Mediatrix 4102S unit|
|FXS1||Port 1 of the FXS card of a Mediatrix C7 unit|
|FXO1||Port 1 of the FXO card of a Mediatrix C7 unit|
All possible endpoint names are listed in the Endpoint table displayed in the DGW Web interface (System/Endpoints). You may also access this table via the CLI by using the EpAdm.Endpoint command or directly via UMN.
If you are not familiar with the meaning of the fields and buttons, click Show Help, 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.
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