I have a 3825 that's a CUBE device. IOS is c3825-ipvoice_ivs-mz.124-15.T8.bin. The SIP invites going out from the CUBE to an 800 number do not contain SDP and therefore, the call is not being setup properly, it rings for several minutes before being connected. This only happens to one specific 800 number. All other calls, even to other 800 numbers, work fine.
The CallManager sends the call the 3825, which is an H323 device in CM. There are no SIP trunks. I tried checking the outbound fast start on the h323 configuration page in CM, but it didn't help.
I tried to force early-offer in the voip dialpeer on the CUBE router but that option was not available in the voice-class sip.
Does forcing early-offer cause the SDP to go out as part of the invite? And, can I configure this globally without affecting other calls? Or, what else do I need to do to force the SDP in the SIP invite? Thanks.