Technically - the packetization rate should be set by the call agent via media negotiation.
Do the phones send early media for outgoing calls with 3rd party agents? If so, do they just advertise everything?
Doing a little digging - these are actually not designed with 3rd party control like the 7940's and 7960's. They aren't a TAC supported solution, which means a TAC case wouldn't get you very far either.
To troubleshoot this, I would do a pretty deep inspection of the SDPs exchanged with CME in this case, as well as the .cnf file downloaded from CME when it registers.
Yes, they DO support iLBC with both packetization settings. The problem is impossible (so far) to set framing either 20ms or 30 ms. The phone tries to play smart as$ switching from 20ms to 30ms randomly, which causes the wolfs wail...
P.S. I have perfectly working CME 7.1 setup with transcoders on CME to support iLBC on the SIP trunk to provider and SCCP 711 inside on the LAN. Now I need make working stand alone 7965 with SIP firmware in it with 30ms frame....
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...