While setting up a configuration for my customer, I _had_ to use a 2811 with 15.1(4)M7. The set-up looks schematically like this:
IVR == SIP Trunk == 2811 -z-> PSTN with BRI
One of the tests is the IVR (10.90.17.153) transferring a call coming from the PSTN via the 2811 (10.64.157.253) back out to the PSTN via the same 2811. When the IVR stays in the speech path (tromboning and thus not releasing the call) all goes well. When the IVR sends aSIP REFER to the 2811, the latter seems not to like that: upon arrival of the SIP INVITE of the IVR a call is set up to the PSTN and as soon as the call is answered (Q931 CONNECT received) the IVR sends a SIP REFER:
And the call is - as you can guess - disconnected. So I read the document on " dynamic REFER handling on the Cisco UBE" and that insinuates that one should use 15.2 or higher to have the CUBE deal with a SIP REFER and consume it.
Is this really a prerequisite for a CUBE to be able to deal with a REFER? I can imagine that SIP REFER was already longer supported by the CUBE e.g. in a set-up where CUCM would send REFER to txfer a call back to the originating gateway. Any thoughts?
yes, I understand that you're eagerly waiting to troubleshoot this but before we dive too deep in details, I'd like to know whether the CUBE functionality on IOS 15.1 can handle an incoming SIP REFER that is trying to transfer a call from the 2811 to the 2811. Or does one really need 15.2 ?
I guess that the key to the problem might be in "cc_api_get_ssCTreRoutingNotSupported" in the output of "debug voice ccapi inout".
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