[SR-Users] About tm retrans time on ser or kamailio 3.1?

[Min Wang]

HI

I did the trace using ngrep:
      ngrep -T -W byline -d any port 5060

And I am confused with  tm retran.

(1) case one
   tm module, the| retr_timer1| default is 500 ms.

#U +0.001824 xxx.17:5060 -> xxx.16:5060
INVITE sip:224 at 172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.

#U +0.000012 xxx.17:5060 -> xxx.16:5060
INVITE sip:224 at 172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.

the ngrep show the  delta between packet, the second invite is only 12 
ms behind?
is my understanding correct?

(2) change retr_timer1 to 2000 ms

modparam("tm", "retr_timer1", 1000)


#U +0.001936 xxx.17:5060 -> xxx.16:5060
INVITE sip:224 at 172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.

#U +0.000013 xxx.17:5060 -> xxx.16:5060
INVITE sip:224 at 172.16.8.49:2057;line=lnzlkxu5 SIP/2.0.

the delta still  13 ms behind, so similar to the case 1,


The question is: is the second invite the re-trans by tm?
If so why it is around 12/13 ms? not the 500 ms or as configured 2000 ms?




thanks.


Kind regards / Mit freundlichen Grüßen

Min Wang




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