We cant transfer a call (offnet destination over h323 gateway) originated in a 7975G (SCCP or SIP firmware) and sended to a SIP Third Party Phone (Advanced) in a Call Manager 8.6.1 Business Edition 5000 instalation.
The call transfer between two SIP Party Phones is OK
The call transfer between two 7975G (SCCP or SIP, we tried two protocols) is OK
The call transfer from SIP Phone (originate) and transferred to 7975G (SCCP or SIP we tried two protocols) is OK
But the call transfer originated from the 7975G (SCCP or SIP we tried two protocols) and transferred to the SIP Third Party phone is not working. The call is missed when we press answer in the SIP Phone.
The call transfer i think is an basic feature on telephony and i cant find the problem.
Note: All the phones registered in the same CUCMBE
Changing the gateway from H323 to MGCP the problem was SOLVED. Regards