Thank you Martin, I have come to look more and more in that direction. When I did the sjphone audio wizard test, in desparation, as my guru had installed the phone and said all was well. Well hard to question him??
Anyway when I carefully did the test I came to the conclusion that the Audio I was producing was terrible, seems I was lucky to do some improvement by switching off the AGC.
Further I have come to the conclusion that if I could 'force' GSM codec I had to be able to do ok as test we have carried out from a 'dial-up' connection
, the audio was impressive. Tomorrow this will again be tested.
At the moment I have hit another problem with the sjphone, it will not respond to *600 echo check, well seems that WireShark sees lots of data but I don't hear anything, no ringing, no audio, just seems to run. My thinking is that if the echo test does not work then other problems will follow.
Any ideas?