After several hours trouble shooting, Brandon with Cisco TAC was able to fix this problem.I just want to post to save someone else time. It is an EZVPN setup from UC540 to SR520 with one 7962 phone behind SR520.SCCP version 17 was negotiated when pho...

UC 540 has one FXO and one SIP trunk. Incoming calls on FXO are pointed to AA extension 500. If you press 4 during AA, it is supposed to use SIP trunk to dial external cell phone. External call transfer is enabled and 9 prefix is configured before ce...