avtransmit isn't very flexible I'm afraid.. the only thing I've tried that worked was a regular CD quality audio file. Basically I took my MP3 file that I wanted to stream, loaded it in winamp and configured winamp to use the diskwriter plugin with 44.1 khz 16bit stereo rather than the default directsound output plugin, then pressed play.. that wrote me a wav file that I could then stream.
What definitely doesn't work is G.711 quality audio... if I created a G.711u audio file via Windows, I could stream it, but the phones wouldn't get anything (I didn't bother to record with wireshark and try to play it from there to verify that really nothing is being streamed). The wireshark thing is a good way to verify that you're really sending audio out.. have it run on the machine you're streaming from, capture udp, then right click on a udp packet and tell wireshark to decode it as rtp.. then you can save the stream as audio file and play it in windows media player.
I am attaching a file that I works well on these phones: 7905/12/40/41/60/61/70/71 with CCM 3.3.x and above. I have also tested it with CallManager simulator and it worked like a charm. This is actually a live recording from an Emergency Alert System (EAS) where PhoneTop Alerts pushes out live audio to Cisco IP Phones.
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