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

[marcus wells]

Thanks Alex

I suspected that no ack was being sent/received too. The invites are getting
sent to the phone but nothing is coming back from the phone to the firewall.
Does anybody know how I can sniff packets being sent and received to/from
the phone and/or modem router the phone is connected to? I can't upload
software to the modem/router or the phone (ie a packet sniffer). Can packets
be sniffed from a linux box on the lan (please excuse my ignorance!)? If so
can anybody point me to a resource that may help?

Thanks for any help

Marcus




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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