asterisk users - Nov 2009 - Asterisk keeps sending invite to sip phone "No response to critical packet"

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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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

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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