I have owned a UC520 since CCA 2.1 and each time you factroy default the unit and re-enter the generic SIP providor the incomming SIP calls are rejected with 500 Internal error. Each time the fix was to remove a Voice Source Group Access list. TAC gave me this set of commands I have used for two years and though 5 upgrades and factory defualts.
conf t
voice source-group CCA_SIP_SOURCE_GROUP
no access-list 2
translation-profile incoming SIP_Incoming
exit
I would have thought through 5 CCA/IOS upgrades this would have been resolved but it is still not and this latest Upgrade to 8.2/8.0.6 this is not working . I ran the commands and calles are still getting blocked. The ITSP said there is nothing they can do and provided this log showing how my UC520 is rejecting the incomming calls.
"Call attempts to your PBX are being rejected with the following error:
U 2011/08/11 02:12:54.667299 74.5.213.95:56006 -> 66.23.129.253:5060
SIP/2.0 500 Internal Server Error..Via: SIP/2.0/UDP 66.23.129.253:5060;bran
ch=z9hG4bKb098.430a5b1.0,SIP/2.0/UDP 208.94.159.10:5060;branch=z9hG4bK-d491
2-4e433aa6-cf91513f-52e9074b..From: "anonymous" <sip:anonymous@208.94.159.1
0:5060>;tag=a9f5ed0-13c4-4e433aa6-cf91513f-1b4c601a..To: <sip:16125207500@6
6.23.129.253:5060>;tag=22DAAFC-4DE..Date: Thu, 11 Aug 2011 02:06:50 GMT..Ca
ll-ID: CXC-223-6b03ce30-a9f5ed0-13c4-4e433aa6-cf91513f-6d6313c@208.94.159.1
0..CSeq: 1 INVITE..Allow-Events: telephone-event..Reason: Q.850;cause=63..S
erver: Cisco-SIPGateway/IOS-12.x..Content-Length: 0....
Why does this happen, what is the fix now and how come CCA and the UC520 have made this so difficult for so many years.
