Hi all.

i encountered  in my 4.1.5 kamailio server some inconstant issue.

I have 2 listen address:

addr1 for incoming SIP requests and as source addr for remote registration (via UAC module)

addr2 for incoming SIP requests only

uac config for regs:

modparam("uac", "reg_keep_callid", 1)

modparam("uac", "reg_random_delay", 120)

modparam("uac", "reg_retry_interval", 300)

modparam("uac", "reg_timer_interval", 40) 

i have response time checking tool, that send OPTIONS every second, which immedeately replied by sl_send_reply("200")  without any processing. Usualy respose time <1ms.

Sometimes (2-3 per day) addr1 stop to response for these OPTIONS (timeout >5sec), while addr2  continue responding with time <1ms.  In kamailio.log at this moment bunch of messages like

ERROR: uac [uac_reg.c:1034]: uac_reg_tm_callback(): got sip response 403 while registering

ERROR: uac [uac_reg.c:1034]: uac_reg_tm_callback(): got sip response 408 while registering

That is normal: some remotes are broken.

The problem is:

1. usually these messages appearing is not the reason of problem, but all problems are while these messages in log 

2. it may be on OFF peak  / ON peak day period

3. in my test installation i have much more remote failure registration (X 10), and the problem is not manifested more often (but i can catch it 2-3 per day)

I think adding more workers for addr1 may help (now 8 worker and 16 CPUs). But it is interesting to understand the source of this issue

--

Savolainen Dmitri