CUBE - SIP Early offer fails when calling from CUCM SIP PHONE
So here's one:
For the ones that are familiar with INE WB vol 1 it's basically module 12 point 2.
So we have a SIP trunk from CUCM to CUBE on CorpHQ router and SIP to ITSP.
Calling from the CUCM SIP phone to PSTN Phone
call works just fine BUT after I enter the command "voice-class sip early-offer forced" under the dial-peer pointing towards ITSP the behaviour is this: the pstn phone is ringing (clid and cnam and all etc) but once I answer the PSTN phone the call on the CUCM IP phone gets droped. No tone or anything. It just gets droped. And call on PSTN phone remains active - it's talking to the CUBE I suppose.
If i remove the command then it gets connected and it works fine.
So this happens ONLY when calling from the CUCM SIP phone. From CUCM Skinny phone I don't have this problem regardless if it's early offer or not.