[c-nsp] SIP not working behind NAT

[Jared Mauch]

On Sep 30, 2010, at 4:35 PM, Roger Wiklund wrote:

> On Cisco routers, we always have to turn the sip nat OFF


This has been my experience as well, the SIP-ALG in IOS is broken, and will also break other SIP (eg: Apple iChat) as well.  I've seen it with Cisco IP phones using SIP behind Cisco IOS that has ALG.  Guess Cisco <-> Cisco wasn't in their test matrix :(

- Jared