[RESOLVED] Asterisk stops answering until "sip reload"

I’m registering Asterisk as an extension on our NEC SV8500.

sip.conf:

[general]
register => 100:100@192.0.2.215:5060/100
register => 101:101@192.0.2.215:5060/101

Everything works great for a while; I’m able to setup the dial plan and experiment with the AGI. The problem is that every few minutes I must perform a sip reload or Asterisk stops answering.

The sip show objects|registry commands offer no clues. Any extensions I register still appear in the output from those commands. I’ve turned on sip debugging and verbose output and see nothing indicating my registered extensions are no longer valid. Asterisk’s console produce no output when I dial my extensions after the few minutes.

I feel like this is an issue with expiry so I explicitly defined the expiry values shown in the sample sip.conf, but this didn’t seem to change the problem at all.

[general]
maxexpiry=3600
minexpiry=60  
defaultexpiry=120
submaxexpiry=3600
subminexpiry=60  
...

This is Debian 8.2 and Asterisk 11.13.1~dfsg-2+b1 was installed from the repository. Is this a familiar problem to anyone, or how can feedback from Asterisk to start debugging this issue?

Finally, pardon my lack of vocabulary. My last venture through Asterisk was years ago and telecom isn’t my first language.

Hi,

when it happend please run :
netstat -antup | grep 5060

if youll see the recv-Q more then 0 that will answer some qustions.

[quote=“batchen”]
when it happend please run :
netstat -antup | grep 5060

if youll see the recv-Q more then 0 that will answer some qustions.[/quote]
There is no change in output from from the netstat -antup command when run immediately after sip reload then waiting several minutes until Asterisk stops answering:

root@asterisk:/home/user# netstat -antup |grep 5060
udp        0      0 0.0.0.0:5060            0.0.0.0:*                           8223/asterisk   
root@asterisk:/home/user# netstat -antup |grep asterisk
tcp        0      0 0.0.0.0:2000            0.0.0.0:*               LISTEN      8223/asterisk   
udp        0      0 0.0.0.0:4520            0.0.0.0:*                           8223/asterisk   
udp        0      0 0.0.0.0:4569            0.0.0.0:*                           8223/asterisk   
udp        0      0 0.0.0.0:5000            0.0.0.0:*                           8223/asterisk   
udp        0      0 0.0.0.0:5060            0.0.0.0:*                           8223/asterisk 

My fault. Firewall rules. I was blocking incoming traffic on UDP 5060 and registration attempts initiated from the phone system were being dropped.