For some reason, I restarted the subscribe server last night( all the phones are registered with the Subscribe Server). When the server came back, i noticed that a large number of IP phones failover to SRST mode. the status of these phones on the Callmanager is unknow. The weird thing is the network connectivity between voice subnet and the callmanager is ok and but these phones don't fail back to CCM. I have to power cycle the phone to get it reregister to the CCM.
Is there any way to get it done automatically? Is it something to do with my CCM/voice gateway settings?