I am strugling to get the MWI indicator to work across SIP for a new cluster. The setup is as follows:
Additionally, this is how the IPTel servers are configured:
CUC Cluster (2 servers)--->SIP Trunk ------>to Older CUCM Cluster (2 Servers); MWI works fine for these users---->SIP Trunk(NOT ICT) ----->to New CUCM Cluster (2 servers) . Both old and new CUCM Clusters are in use and serve different set of users. Both the CUCM clusters have same number as Voicemail Pilot.
The phones are combination of SIP and SCCP (both having issue) but they never receive the SIP message to turn on the MWI. Moreover, the CUCM cluster in the Middle seems to send out 4XX SIP error message (client error) as if it is trying to send out the message but can not figureout where to send it.
I strongly suspect that its integration issue so I need to know if this setup is known to work.
Thank you Rob for replying to my Query. It took me some time as I was testing the setup in lab and it seems to work on CUCM 8.6(2a)SU2 which is recently released and on the version that our client is using 8.6(2a)SU1.
I was also able to isolate the issue by using packet capture on Intermedialte CUCM.
The problem seems to be with digit manipulation on GW (this is why the problem did not replicate in lab and CUCM DNA was not able to point it out). Also, MWI across the SIP Trunk from 1 CUCM cluster to another works fine which also suggests something wrong with external calls.
CLID for all the calls is being transformed into a single number for this site and even though the Call reaches individual voicemail box on Unity based on ANI, the MWI gets screwed up. I will be doing more troubleshooting around GW tomorrow and post my findings.
Do you know what role would the ANI have in CUC SIP messages?
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...