-2811 12.4.15.T6, advanced service provider
CUCM group has Sub, Pub, SRST. Sub is shutdown, phones are registered to Pub as active and SRST as standby. when the remote site switching to SRST mode, no DN on the IP Phone.
Back to normal mode and removed Sub from CUCM group. when switching to SRST mode, now I can get DN on the IP Phone.
Q) why SRST site IP phone cannot get DN in SRST mode when Sub shutdown while the Sub part of CUCM group? Bug?
Thanks in advance,