Gianni Fioretta wrote: > Hello. > > I have a problem with Asterisk, sometimes it hangs up an external call after > 20 seconds, apparently without any reason. > The call comes from a SIP server hosted from EuteliaVoIP, many peers rangs > and one of them answer, the call ends itself after 20 seconds from the answer. > I've tried many configuration in sip.conf, but no one solved the problem. > > Log from /var/log/asterisk/messages: > [Oct 8 15:49:05] WARNING[10659] chan_sip.c: Hanging up call > e3f0204b-b35811de-bba58889-6d53c...@83.211.2.220 - no reply to our critical > packet. > > and from CLI: > [Oct 8 15:52:26] WARNING[10659]: chan_sip.c:1950 retrans_pkt: Maximum > retries exceeded on transmission > 59e62874-b35911de-9a598915-c5a6b...@195.62.226.16 for seqno 101 (Critical > Response) > [Oct 8 15:52:26] WARNING[10659]: chan_sip.c:1972 retrans_pkt: Hanging up > call 59e62874-b35911de-9a598915-c5a6b...@195.62.226.16 - no reply to our > critical packet. > == Spawn extension (incoming, 03411885583, 4) exited non-zero on > 'SIP/03411885583-081e0d78' > > (peer 101 was not connected at this time, but Asterisk also hags up with all > the peers connected) > > Any idea? > > Thanks in advance. > > This is a very weird Asteriskism that we see from time to time. Some SIP servers don't route ACK packets properly (or there will be an ACK loop). The nature of ACK packets is.... tenuous at best in the SIP world. Many clients don't even send them. Asterisk relies heavily on ACK packets to determine if a call is currently connected. If it doesn't receive one, it hangs up the call, even if the rest of the packets have been routed properly and the call is working fine.
There's no configuration to turn this off, but there is a way to remove the check in the code. I can't recall the appropriate line to comment out, though. Perhaps someone else knows? In an ideal world, when Asterisk sent an ACK, whatever server/client it was connected to would respond accordingly. It is, however, not an ideal world, so this doesn't always happen. N. _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
