I briefly describe my scenario:
CUCM 6.1----->Cisco 2821(voice gtw)--->registered with Sip provider.
Truk between CUCM6.1 and VG is H323, on the VG, I setup a sip-ua I also specified on the route pattern the calling party transf.mask to attach the uri on the outbound call. Registration comes up, everithings works fine except I cannot use transfer softkey on any phone (displays key not active)so I cannot transfer at all the calls.
I Already trie the same connection using an UC520 and everything works fine.
I don't know if I have to specify something else on the CCM.
Thank you very much for your help