VoIP Ethernet Capture TMG7800

Physical Setup

To do a VoIP capture with a TMG7800, it is required to:

• Connect one of the VoIP Ethernet port (VOIP0 or VOIP1) to a laptop with a straight ethernet connection. The laptop must support a gigababit connection
• Use Wireshark on the laptop.

Once the physical setup is ready. It is possible to start capturing the RTP.

Preparing Tmedia for Capture

• Access the telecom unit (TMG7800-TE, TMG7800-DS3 or TMG7800-STM1) you want to capture using telnet.

telnet [eth0 IP address of the telecom unit]

For example

telnet 172.16.123.45

The prompt will now be:

0/tbgw>

• Start Wireshark to capture the Ethernet packets with the connected laptop.

Start the Capture

• Do one of the following command to capture packets according to your setup:

For capturing all Ethernet packets that go through VoIP0 and copy them to VoIP1

mv88eMonitor 0x4 0x4 3 600

For capturing all Ethernet packets that go through VoIP1 and copy them to VoIP0

mv88eMonitor 0x8 0x8 2 600

• Stop Wireshark and save the captured data to a file

To stop the Capture

mv88eMonitor 0 0 3