when try to remove directory number (Line no.)  for enabling extension mobility  from SIP enabled Cisco 7911 IP Phone , the phone gets unregisterd.Any idea to solve this issue?

We have two 2801 routers terminating one isp each on routers.We would like to configure redundancy not load balancing . I used HSRP with multiple interfaces between two routers but no failover happening

I am trying to integrate CCM 6.1 with AVaya 8700 . it is likeCCM-->Firewall --internet --firewall--- AVAYA8700.From avaya incoming call is happening ,outgoing call from CCM not happening , busy tone coming. When i trace this it is showing H225 tunne...

I am trying to integrate with Avaya using H323 gw.incoming call from avaya is happening But from the CM is not going out busy tone is showing. i created region , device pool for this and create a gateway point to avaya ipbx . But registration unkown...

How to get rid of " Please wait While transferring Call" in Cisco Unity Connection