[asterisk-users] No reply to our critical packet

[Luca Bertoncello]

Hi list!

Today I tried to change the NAT-configuration on my Firewall to use  
another port for SIP.
I configured it so:

/sbin/iptables -t nat -A PREROUTING -p udp -m udp --dport 10000:10100  
-j DNAT --to-destination 192.168.20.120
/sbin/iptables -t nat -A PREROUTING -p udp -m udp --dport <my new  
port> -j DNAT --to-destination 192.168.20.120:5060

then, I tried to log on my Asterisk with my mobile phone.
It works. Great!

Then I tried to call an extension I created for the tests. This  
extension just play a beep, record a message and play it back.

I hear the beep and I can speak my test message, then I can just hear  
a couple of seconds of my message and I get this error:

[Jun  9 07:41:56] WARNING[19374] chan_sip.c: Retransmission timeout  
reached on transmission 1ec8759e5160b42b92000629ec5e4771 at 10.102.46.147  
for seqno 993 (Critical Response) -- See  
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 13569ms with no response
[Jun  9 07:41:56] WARNING[19374] chan_sip.c: Hanging up call  
1ec8759e5160b42b92000629ec5e4771 at 10.102.46.147 - no reply to our  
critical packet (see  
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions).

I'm really not sure, what can be the problem, now...
I read the wiki page, but I can understand what is wrong now in a  
configuration that works for days...

Have I to say Asterisk, that the NAT receive data from another port?  
This is the only change in my configuration since yesterday, as all  
worked...

Thanks
Luca Bertoncello
(lucabert at lucabert.de)