Call drops

Asterisk Asterisk Support
1

I have been chasing a problem with aastra phones and asterisk v 1.4.0 and 1.2.15 as well. You will start the call and it will connect, then i will get a warning message on the console stating that the system exceeded the maximum retries for a packet to the phone and the call will drop.

this is the message:
Feb 26 19:32:42 WARNING[24976]: chan_sip.c:1226 retrans_pkt: Maximum retries exceeded on transmission 276bc0ff526178ba52c2cf72845b20d6@10.252.99.216 for seqno 1845472325 (Critical Response)
Feb 26 19:32:42 WARNING[24976]: chan_sip.c:1243 retrans_pkt: Hanging up call 276bc0ff526178ba52c2cf72845b20d6@10.252.99.216 - no reply to our critical packet.

same message every single time this happens.

2

What firmware version have you got on your phones and what is your NAT situation?

3

Sounds like NAT

4

1.4.1.1077 for firmware version on all the aastra phones. After reading your reply i check the nat settings on the phone and on a whim turned on teh nortel nat setting and everything is working fine now.

5

I hadnt really thought about nat as we are behind a netgear and the server is in the dmz. Of course that a whole other story.

6

try the latest firmware 1.4.1.2000. also try playing with the params SIP NAT PORT and SIP NAT IP…