Hello All,
 
I have a UCM version 8.02 utilizing an internal SIP Trunk to an IVR (server).  The SIP Trunk functionality works well to the IVR, but if I initiate a transfer from the IVR to an outside number the call fails.  The call from the IVR utilizing a SIP trunk attempts to transfer to my 2811 voice gateway configured as MGCP.  The 2811 has 2 PRI trunks connected to a CO simulator (Hammer), which through scripting will answer the calls.  I can make an outbound call through the PRI Trunk group from the IVR, IP phone or SIP phone connected to the UCM but if I try to initiate a call transfer from the IVR using the SIP trunk, the call fails.
 
Here is the strange part, if I connect the UCM and IVR  to an H.323 gateway instead of the MGCP gateway the call transfer works like a champ.
 
This is a Lab environment so there is no Calling Search Space setup.
 
 
I'm guessing there is a config issue with the 2811?  But not sure on that.
 
Any help would be greatly appreciated.
 
Thank you...Frank