[c-nsp] SIP problems with 1721

[Rodney Dunn]

There have been bugs in the past.

A quick search showed some like:

CSCec06912
Externally found severe defect: Resolved (R)
NAT-SIP: embedded address incorrectly modified

In recent code you can do:

Router(config)#no ip nat service ?
  H225       H323-H225  protocol
  fullrange  allocate all available port of 1 to 65535
  list       Specify access list describing global addresses
  ras        H323-RAS protocol
  sip        SIP protocol
  skinny     skinny protocol


I don't know how far back in IOS we added SIP nat support.

Rodney


On Thu, Dec 09, 2004 at 11:21:10PM +0100, Andreas Sikkema wrote:
> Hi,
> 
> I'm working for a VoIP providerin Holland. We've got a customer with a
> Cisco 1721 router running software which the customer calls 12.2
> (Unfortunately I don't know anything more, they apparently know on know
> how to configure some simple things).
> 
> Behind their router is a NATted SIP device which is trying to make calls
> using our servers. Unfortunately the router understands the SIP
> protocol, and tries to solve the NAT problem it thinks there is by
> changing the IP addresses. I think there's a bug in the software because
> it corrupts the SIP message.
> 
> Is there a known problem? Is there an easy way to shut down the SIP
> "helper"? We've been looking for info on the Cisco site, but couldn't
> find anything. 
> 
> -- 
> Andreas Sikkema
> 
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