How to forward SIP calls and retain caller ID?

We have a Cisco UCM and we use a SIP trunking vendor for telephony.  The SIP vendor only allows calls from DIDs that they own.  But say I am at my desk phone and I want to forward all calls to my cell phone.  AND I when the call gets forward to my cell phone I want to see who the actual caller is.  How would I do this?  
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amigan_99Network EngineerAsked:
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amigan_99Connect With a Mentor Network EngineerAuthor Commented:
We were able to get this working using the following voice class sip-profile:

voice class sip-profiles 1
request INVITE sip-header Diversion modify "" ""
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PlantwizCommented:
Are you able to forward calls current? And is the problem merely that there is no Caller ID with the call?

I've seen some provisioning not support a call forwarding feature, while some with only limited functionality...number only, but not a name.

Have you tried to work with your provisioner about what options you have?  Or do they possibly have a forum where others discuss this sort of issue.  Forgive me, but it seems as though you may want to 'get around' (lack of better term) something from within their package?  If that is not the case, maybe escalate the case to someone who can assist with custom provisioning.

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jfaubiontxCommented:
Sadly you can't. Your SIP provider is probably using the Broadsoft soft switch which by default doesn't trust any caller ID that it has not set itself. If you try to send a call with other caller ID information the call will have the caller ID stripped and sent with your caller ID at best or the call will be denied and blocked. This is because they do not consider the call coming back from you as the same call. It is a new call from your system to them and thus must have one of your DID numbers associated.

We have been battling this for several years now. The only way around it right now is to use a PRI from a provider that will allow the caller ID to be set. Logix and Cbeyond both currently allow this. Cbeyond is making a change in the next few months to move their PRI customers to the Broadsoft switch which will break this at that time. We have been told that if you get in before they move to the Broadsoft, you should be able to stay on the current platform. If we have a customer that we know relies on the follow-me or call forwarding features, we try to steer them to Logix for now. We are not happy with it but we have to deal with it for now.

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nsitsupportCommented:
Have you tried blind-transfer?
Normally with blind transfer you will not be in the middle and it will transfer the caller to called number.

http://www.net-grp.com
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amigan_99Network EngineerAuthor Commented:
Sorry I've been lax in getting back on this.  We solved the problem and yes they use the Broadcom session border controller.  I'll try and dig this out either later tonight or tomorrow.
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