[asterisk-users] Got SIP response 400 "Bad Request" back from

[Christian Tardif]

Hi,

I have an Asterisk 1.8.2.3 installed (public IP) with a peer (Polycom 
IP601) installed behind NAT.

When the peer makes a call, it's working without any problem. But when a 
call is coming back, it ends up with a Got SIP response 400 "Bad 
Request" back from xx.xx.xx.xx where the xx.xx.xx.xx is the public IP of 
the peer. And the call drops to the voicemail (congestion at peer end)

I digged it the Internet searching for answer, but I didn't find 
anything relevant. Anyone experienced this problem?  How can I fix it?

Thanks,

Christian Tardif
christian.tardif at servinfo.ca