I have a setup with 3 ap1242 and UC520, no WLC. When moving around with a CP7921 there is a voice gap (about 2-3 seconds) when the 7921 switches from AP. The call does not get disconnected.
IOS running on AP:
Can anyone help me figure out what causes this problem?
There is an issue with the autonomous AP (CSCsx07150), where CCKM is failing. This appears to be handing the TSPEC that we send for SCCP traffic (UP4).
The workaround here is to enable "admit-traffic" under the ssid config. In the AP webpage, it is listed as "Call Admission Control", which will add the admit-traffic command.
Below is an example:
dot11 ssid voice
authentication open eap eap_methods
authentication network-eap eap_methods
authentication key-management wpa cckm
This will go into the next 7921/7925 Deployment Guide to ensure that admit-traffic is always enabled.