I'm having some problems with phone roaming. The equipment is wireless phones 7920 with firmware 7920.3.3-01-05 and callmanager v3.3.3. The security is made with LEAP and it's working fine.
The access points are configured in different channels. The ip helper address is correctely configured between the wireless and wired vlans.
When the phone roams, the authentication is done and the phone keeps indefenitely trying to register in callmanager and get stuck in IP Network configuration and finaly appears - no service ip config fail. The call keeps up but there is no sound and after some seconds the call finish.
It seems everything ok with AP configuration.
Do you have any idea to help to solve this problem?
This is likely a problem with DHCP and/or IP addressing. The "Configure IP Network" message indicates the phone is attempting to obtain an IP address from the DHCP server. The "No service-IP config. failed" message indicates that the phone failed to obtain an IP address from the DHCP server.
Seems like you may be attempting to roam at layer 3 (ie. across subnets, vlans). Keeping voice calls up when layer 3 roaming is not possible.
It seems to be a normal behaviour (obtain IP address when phone roams) in a L2 environment. I found this statement on FAQ 7920 section:
"Q. Does the Cisco 7920 support Layer 2 roaming with active calls?
A. Yes, a Cisco 7920 IP Phone can maintain an active call when roaming between access points that have coverage for a single Layer 2 subnet, but calls are dropped when the phone roams into the access point coverage for another Layer 2 network.
When the Cisco 7920 roams into a different Layer 2 network, it drops the active call and then goes through the process of authenticating, associating, and obtaining a new IP address before it can register with the Cisco CallManager server again."
Right, so you are roaming into another layer 2 network (thus the need to obtain a new IP address). Roaming to ANOTHER layer 2 network is the equivalent of layer 3 roaming.
As the FAQ indicates, you are able to keep a call active if roaming at layer 2, but if you change to ANOTHER layer 2 network, then you have to obtain a new IP address. In your case, this seems to be failing (given the 'No service-IP config. failed" message you are getting).
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