I am configuring Extension mobility on CUCM version 7.1.2.  I am looking for the device type to show the 6921 ip phone but this does not show in the drop down box, i have a few of these phones on the system and registered. Does anyone know why this w...

I have a WS-C2960G-24TC-Lwith a 1000base LX SFPconnected via single mode to an Incomming gigabit circuit from SSE/Telco (Scottish and Southern Electric)this configuration works ok.When i move the connection to a WS-C3750G-24TS-1U (with the same sfp) ...