I have Issue with Polycom SoundPoint IP 335 Phones connected to Cisco 4507 switch. I can make the calls but While connected to call, experiencing pause for 1-2 seconds, every 90 Seconds. Call is not getting dropped. Its just a pause fo 1-2 secs. Conf...

I am working on  WS-C2960-24LC-S and software Image C2960-LANLITEK9-M  version 12.2(50)SE4. I am trying enable TACACS management to that switch. The IP TACACS source-interface vlan90 is executing but it is not visibile in running config. where in IP ...