I'm looking for some help, since I can't explain/understand/... why the following is happening.
I have converted my 7975's (2) plus a 7911 to SIP 8.5.3 on my UC 520.
Inbound calling is working
Outbound calling is working
I can not call internally from the 7975 to the 7911, but I can call the other way (791 to 7975).
But more importantly, and the main reason for this post ...
When I call the 7975's, after the timeout it goes to voice mail, as expected, but the screen still looks like the extension is rining (phone icon off the hook, and caller id info still displayed). This happens for an internal call (7911 to 7975) as well as for an external call to the parallel hunt group. The only way I can get the phone to stop displaying the caller id info, and the screen to change back to what it looks like before a call is to power cycle the phone.
A reset and/or restart do not help. Also, if I try calling the extension again, it doesn't go through...I get an 'error' sound. If I call from the 7911 and pick up the 7975, then hang up. The call disconnects properly.
ANY help would be appreciated.
OK, I see the signaling now. The phone and CME look to be exchanging the correct signaling until after the 487 is ACK'd. This looks to be a phone issue. Would you be wiling to upgrade to the latest firmware,9.0(2)SR2, and test again?