[asterisk-users] Lost outgoing SIP packets

[Tech Support]

Hello;
    I ran into a similar problem not long ago. Always try the easiest (and
cheapest) solutions first. My solution was to replace the Ethernet cable and
then to change the network switch port. Did the trick. Switches with errors
tend to be due to faulty switch ports.
Regards;
John V.  

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Roel van Meer
Sent: Thursday, March 31, 2016 7:35 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Lost outgoing SIP packets

Hi list!

I have a problem where SIP packets sent by Asterisk do not hit the wire, and
I don't know what could cause this.

I'm running Asterisk 1.8.28_cert5 with full SIP debug. At the same time, I'm
doing a tcpdump of the traffic on the network interface. I can see in the
SIP debug log that asterisk is sending packets. Most of the time, I can see
those packets in the tcpdump, as you would expect.
However, sometimes Asterisk sends a packet that *does not show up* in the
tcpdump. Asterisk then does several retransmits (that also don't show up).
The next packet that is not a retransmit does show up again.

This causes Asterisk to log the peer it was sending packets to temporarily
as Lagged or unreachable.

There is no outgoing firewall on this box.

Could anyone give me some pointers where to look?

If Asterisk logs "VERBOSE[13019] chan_sip.c: Reliably Transmitting (NAT) to
x.x.x.x:" you would expect to see that packet in a tcpdump trace, right?  
What could cause this not to be so? Are there network statistics I could
look at? Is there a counter in /proc or /sys for problems with sending
packets? Anything?

If more information is necessary please do let me know.

Thanks a lot in advance,

Roel

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