VoIP, problem transferring calls after upgrade of Router/IOS
we have a Voice over IP connection to some offices abroad which are on both sides connected with a Cisco router via an E1 connection to an Ericsson MD110. It used to be a 3725 with IOS 12.2(13)T16 on both sides. Since we upgraded to a 2811 with 12.4(13r)T on the remote side, when ever a call is transferred on the remote side or an automatic diversion is set, we get a disconnect. ISDN debugging showed the error message: "Mandatory information element missing", see the attachment for full output.
Any ideas on what might be missing and what might be a workaround?
Re: VoIP, problem transferring calls after upgrade of Router/IOS
What happens it that bugs are created then fixed; supposedly they should not stay forever.
Else you can raise a case with th TAC, but the may ask you to upgrade anyway before filing a new bug.
You can investigate if the message is sent in H.323 and "local router" drops it, but I think it is more likely is that the message is never sent over H.323. That would isolate the defect on one or the other router.
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