[c-nsp] Unwanted SIP rewriting on a C850

[Church, Charles]

It's not documented, or if it is, it's not at all clear, but throw this
in the config:

no ip nat service sip tcp port 5060
no ip nat service sip udp port 5060

Had the same issue six months ago.  It's not supposed to be a default.
The NAT process by default tries to change the SIP addresses in the
payload.  The turns it off, and lets the softswitch and VoIP endpoint
deal with NAT themselves. 


Chuck Church
Principal Network Engineer, CCIE #8776
Harris Information Technology Services
EDS Contractor - Navy Marine Corps Intranet (NMCI)
1210 N. Parker Rd. | Greenville, SC 29609 
Office: 864-335-9473 | Cell: 864-266-3978


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Rhett Bassett
Sent: Monday, October 22, 2007 2:38 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Unwanted SIP rewriting on a C850


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

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