This is almost certainly not an Asterisk-specific posting, but due to my inability to find a VoIP-focused Cisco list, I'll post here in the hopes of finding a more diverse user community.
I am using a Cisco 7960 (version 6.0 SIP firmware) with Asterisk, and have been experiencing situations where the phone locks up. "Locks up" means that the bottom part of the screen ("Your current options" and the redial/newcall/cfwdall keys) disappears, and all keys on the keypad are non-functional except for the *-6-settings reboot keys.
Previous software (4.4) exhibited the same symptoms. I replaced the 7960 with a brand new 7960G, thinking it was bad hardware. Same symptoms. I replaced the power supply, thinking that perhaps could be the problem Same symptoms. I upgraded to 6.0. Same symptoms. I replaced the ethernet cables. Same symptoms. I invoked an ancient curse-removal spell involving chicken bones and eye of newt over the phone. Same symptoms. A phone elsewhere in the same office (same switch, etc) works with no problems, but does not have a PC hooked to the 'PC' ethernet port. In fact, the first 7960 I tried, with the swapped out power supply, works well elsewhere.
I have used 79xx boxes in many circumstances, and all have performed admirably. However, I rarely have configured them so that a PC is connected to the other side of the device. The PC is running Windows XP, and sees mild SSH/email/web traffic. I cannot say if there is a correlation between traffic volume and failure intervals; I have no data.
The only thing that remains the same is the PC on one side, and the switch port on the other. Previously, the PC attached to that switch port had worked without any problems for quite some time before I put the 7960 in place. Even if the problem is the PC or the switchport, a failure or malfunction on one of those two components should not cause the phone to malfunction. If it is a problem with the 7960 pushing traffic across the tiny built-in switch, then we have a real problem on our hands that Cisco had better fix, pronto.
I would appreciate reports of others as to similar issues or resolutions which they found effective.
JT
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