I´m getting one way voice between a CCM4.02Sr2c and a Panasonic IP enabled PBX. I´v configured the Panasonic PBX as an h323 gateway in Callmanager. Result: The PBX users can hear me - I can´t hear them. Doesn´t matter who set up the call. I have tried some different codings, MTP enabled and also disabled. No difference. I also worked in Service parameters to not force a symmetric payload size. No difference.
On my Cisco Phones I can see the RX-Counter running up with G711u, but I can´t hear some voice. When I use ethereal there´s "nothing" in the stream. (maybe noise)
When I do the test to the Panasonic PBX directly with an H323 Softphone, everything works fine! I see the PBX´s RTP packets coming in with an SSRC-ID fivethousandsomething. My own ID is much much higher (so I used to know the SSRC) Does this low ID cause problems to the MTP or the phones?
I do not have a hardware MTP in place with which I could test transcoding.
Any ideas (beside kicking the Panasonic PBX :-)))) ?
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