my diagram as below
Phone1---CCM1----GW1----(IP Network)----GW2---CCM2---Phone2 | |---Phone3
I configured all using G711u. The problem is that when Phone1 call Phone2, it works fine. But when Phone2 press Transfer to transfer to Phone3, the call drops.
I know CCM dont have H450 capability, but still dont have any solution to solve this problem yet.
Does anybody know how to fix?
I attached config of two GWs
This sounds like a combination of a DTMF relay problem and codec mismatch.
Make sure that the third phone has a transcoder available, and check the dial peers you're matching for calls with 'debug voip dialpeer' to make sure you're matching the right dial peer for each call leg.
Also, try 12.4(22)T. It's got tons of CUBE updates.