[asterisk-users] Asterisk keeps sending invite to sip phone "No response to critical packet"

[Alex Balashov]

Asterisk is not receiving replies to the INVITE - probably due to NAT 
issues.

marcus wells wrote:

> Hi there
> 
> I am wondering if anybody can help me illuminate a problem I am having 
> with my asterisk installation. I am using:
> 
> - IP phone (Siemens gigaset S685IP) behind a modem/router that has ports 
> udp 5060 and 10000:10100 forwarded to the static ip of the IP phone 
> (192.168.0.3). This has to go to:
> - modem that operates in half bridge mode (no nat) to a linux firewall 
> (does natting ip is 192.168.0.20) that has the ports above forwarded to 
> the staitc ip of the asterisk box (192.168.0.21 packaged version for 
> ubuntu hardy).
> 
> This phone works fine with a commercial provider of viop (via asterisk), 
> but I can't get it to work with my install of asterisk in my remote network!
> 
> ngrep-ing traffic on the firewall shows asterisk continually sending 
> invites to the public ip of the ip phone.
> 
> I would be very grateful for any pointers of where to start. If you need 
> sip debug or ngrep info let me know and i'll reply with it. I've been 
> beating my head against this for some time now!
> 
> Thanks in advance
> 
> Marcus
> 
> 
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-- 
Alex Balashov - Principal
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671