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New Member

E164 MWI with Exchange UM

Hi all,


Having a problem with getting MWI to work with CUCM and Exchange when using E164. We have a SIP trunk to Exchange which hosts the voicemail.


- I have tried the extension without the + and if the mailbox also doesn't have a plus, direct greeting, forward greeting and MWI work correctly.

- If the extension is used with a + and the mailbox doesn't have a plus, I have used a mailbox mask to strip the plus, and then re-adding the plus on the incoming calls on the SIP trunk. The forward greeting works correctly, but the direct greeting does not, and neither does MWI.

- If I set both the extension and mailbox to use full E164, the call will ring at the phone, then when it tries to go to voicemail, the caller will get a busy tone. When looking at the CM traces, I can see a 403 forbidden message coming back with "Diversion header format is incompatible with the URI type of the UM dial plan."


I've checked the Multi Tennant MWI is enabled so I don't think this is a problem in this case. Is the fact that I am getting "Diversion header format is incompatible with the URI type of the UM dial plan." when using full E164 every point to a problem with the Exchange configuration?

New Member

I'm having this issue.  Did

I'm having this issue.  Did you figure out how to fix it?

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