[c-nsp] Unwanted SIP rewriting on a C850

[Rhett Bassett]

List-

I've got a C850 running 12.3(8r)YI4 that's got a taste for SIP messages.

At no point in my config have I given the slightest "ip inspect" or
"appfw", yet it would appear to be rewriting (viewed from tcpdump) SIP
REGISTER messages, which is counter-productive from my SIP provider's
point of view - they say they're seeing the same thing.

I'm really not looking forward to ACL hell, if that's what this is
leading towards...  Hopefully there is just an overlooked 'no router eat 
sip' command I've missed.

Any leads?

--
Rhett Bassett
Research and Development
Hunter Communications