[c-nsp] SIP problems with 1721

[Rodney Dunn]

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087d43.html

12.2(8)T we added NAT support for SIP.

The migration path from 12.2xT is 12.3 so they
should go with 12.3(12) that is on CCO.

I didn't have a 12.2(8)T image in my lab loaded but
happened to have:

12.2(10.1)T image on a router and I see the nat
sip service there so I bet it was in 12.2(8)T.

Router(config)#no ip nat service ?
  list    Specify access list describing global addresses
  sip     SIP protocol
  skinny  skinny protocol

Rodney


On Thu, Dec 09, 2004 at 05:42:01PM -0500, Rodney Dunn wrote:
> 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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