Headend = CUCM 7.1
Remote Site: Cisco 2811 ISR configured via MGCP
2811 ios version = c2800nm-adventerprisek9-mz.124-22.T.bin
Cisco 7931G is displaying "WAN-DOWN SRST MODE", however CUCM shows that this phone is registered. 7931 shows that the CUCM is "ACTIVE" and that SRST is "Standby".
Below is the show ephone output from the router:
<router>#sh ephone 7931 | include REGISTERED
ephone-137 Mac:001A.6C7C.6E39 TCP socket: activeLine:0 REGISTERED in SCCP ver 17/9