[Asterisk-Users] who changed the codec?

[Matthew Boehm]

'morning everybody,

Here is the setup: 5126800422 called 3035 (3035 is a Cisco 7960). The call
is g729. 3035 presses 'Conference' on her phone and calls 8327549222. This
call is ulaw. (65.72.107.2 is our Cisco 7206 SIP->PRI gateway.)

asterisk*CLI> sip show channels
Peer             User/ANR    Call ID      Seq (Tx/Rx)   Format
65.72.107.2      8327549222  1758081f67e  00102/00000   ulaw
10.0.0.48        3035        0008a3d2-05  00101/00102   ulaw
10.0.0.48        3035        0feb1c11386  00103/00101   g729
65.72.107.2      5126800422  28D20837-69  00103/00101   g729
4 active SIP channel(s)

5126800422 is still on hold while 3035 talks with 8327549222.
3035 now presses 'Join' on her phone and this happens:

asterisk*CLI> sip show channels
Peer             User/ANR    Call ID      Seq (Tx/Rx)   Format
65.72.107.2      8327549222  1758081f67e  00103/00000   ulaw
10.0.0.48        3035        0008a3d2-05  00102/00102   ulaw
10.0.0.48        3035        0feb1c11386  00103/00102   ulaw
65.72.107.2      5126800422  28D20837-69  00104/00101   ulaw
4 active SIP channel(s)

Suddenly, 5126800422's legs are ulaw. What is interesting is that BOTH legs
were changed. The leg from Cell->7206 was changed AND the leg from
7206->Asterisk->3035 was changed.

Could this be the 7960 that changed the codec? or was it asterisk?

Any thoughts?

Thanks,
Matthew