Sorry for the cross post, trying to work through an issue since changing my email address
I have an ITSP that has a new platform that differs from its legacy platform in that it can only handle Invites that have the SDP. In my testing with them, when a call is answered by the auto attendant, and then transferred to an extension, it rings and then hangs the call up. They call this 3PCC, essentially they can only handle Invites with SDP. This new platform supports diffserve marking, which is a great reason to be able to move to it, but the lack of support for Invites without SDP is an obstacle it seems. They claim this is perfectly acceptable in the standards. Can someone confirm if that is the case or not? Additionally, there were some fixes being created for ill behaving ITSPs, does anyone recall if this was one of them. It tried these trunks on 4.2.1, without success. Or, has anyone found a workaround for this short of an external Session Border Controller? Any thoughts or ideas would be appreciated. I'll keep reading the archives in the mean time.
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