[cisco-voip] CUCM CFA to SIP Trunk Fails

Tue May 31 12:52:43 EDT 2011

Ryan,

SIP providers usually don't allow calls out from numbers not provisioned on the SIP Trunk, unlike traditional TDM. It's very likely the source phone number of the forwarded call is the ANI of the number originating the call, which is not provisioned on the SIP Trunk.

You can fix this by modifying your SIP Trunk configuration. Go to the trunk in question. In the 'Outbound Calls' section. Make sure the check box 'Redirecting Diversion Header Delivery - Outbound' is checked. Change the 'Calling Party Selection' drop down from 'Originator' to 'First Redirect Number (external)'.

That will force the call to use the external number mask of the forwarded phone as the Calling Party. The external number mask, assuming you are using one, should be equal to a provisioned DID on the SIP Trunk.

That's how I fixed this issue when I ran into it.

Best of luck

Message: 6

Date: Tue, 31 May 2011 12:13:12 +0000

From: Rynard Coetzee <Rynard.Coetzee at bytes.co.za<mailto:Rynard.Coetzee at bytes.co.za>>

To: "cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>" <cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>>

Subject: [cisco-voip] CUCM CFA to SIP Trunk Fails

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Hi There

I have an issue with forwarding of calls from a DN on CUCM to a PSTN number that is routed across a SIP trunk ,i can call the PSTN number directly but when i forward the DN to the number the call fails when dialled from a different phone. If i dial only the extension of the DN the call proceeds though ,it only happens when dialling the DID number.

Any ideas ?

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