[asterisk-users] Grandstream

[Thomas Kenyon]

Phibee Network Operation Center wrote:
> I have a problem connecting a Grandstream ipphone to an asterisk.
> 
> The ipphone is behind a nat router, I redirected UDP 5060 and 5004 to my
> phone.
> It connects well to the asterisk server. I can call outside and receive
> calls from outside without any problems.
> 
> But if I call from this ipphone to another ipphone connected on the same
> asterisk server, using internal dialing, I can hear my correspondant, but he
> cannot.
> 
> Do you have any idea?
> Thanks for advance.
> 
This is usually a NAT issue, what happens if asterisk is kept in the 
media path? (by setting canreinvite=no the peer declaration for your 
handset in sip.conf).