Exchange 2010 UM with Blocked numbers

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We've got Cisco doing our phones and Exchange handling the Voicemail. We had issues transferring from Voicemail back to Cisco so we flipped two settings (cisco side) so that it always displays the original calling number. Now we can transfer back if you don't want to leave a message or whatever.

But now transfers from Cisco to Exchange are failing.

We're seeing the From Address as "SIP from address: sip:10.xx.xx.51" instead of "SIP from address: sip:5600@10.xx.xx.51". Because the extension isn't being passed Exchange is throwing a 400 Bad Request error and dropping the call.

Just wondering if there was a way to have Exchange accept transfers from anonymous numbers?


Apparently I need an extra day after a 4 day weekend to get back up to speed, we're running Exchange 2010 not 2007 as the title on the post originally listed :confused:
Bumpped up logging on the UM->Core section to expert and we get the following

The Microsoft Exchange Unified Messaging service rejected the call for the following reason: Microsoft.Exchange.UM.UMCore.CallRejectedException: The format of the request isn't valid.
at Microsoft.Exchange.UM.UMService.UMConnectionManagerHelper.BaseUMConnectionManager.CreateRoutingHelper(SipRequestReceivedEventArgs args)

at Microsoft.Exchange.UM.UMService.UMConnectionManagerHelper.BaseUMConnectionManager.OnIncomingSession(Object sender, SessionReceivedEventArgs args)
You'll probably need to find a setting on the Cisco side to send something like 0000 for anonymous calls. My guess would be that Microsoft is (probably correctly) treating the caller field as required.
The original way it's configured on the Cisco side, it'll append the voicemail extension to Blocked numbers. But then you can't transfer
back to the operator. Fixing that glitch has led to the new one.
To close this off, MS support said that the behavior is by design (reject malformed SIP header) and they don't have a specific setting that we could enable to accept the traffic.
I can test our setup monday. We run CUCM 8.5 and Ex2010.


What do you have Rerouting Calling Search Space and Out-Of-Dialog Refer Calling Search Space set to for the trunks for UM?

Also is Redirecting Diversion Header Delivery - Inbound enabled? What about Outbound?
Thanks! I'm out of the office till Wed but I'll check the settings.
7 posts