Hi Chen-Che,
Yes, your understanding is correct - but aside the dispatcher params, in
case the destination does not answer at all (no reply back), how long it
will take for opensips to generate 408 for one OPTIONS is dictated by
this "fr_timer".
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com
On 03/26/2013 05:00 AM, microx wrote:
Hi Bogdan-Andrei,
Thanks so much for your reply. Previously, I thought that the detection
mechanism works as follows. The outbound proxy sends an OPTIONS message to
an internal SIP server every 3 seconds (ds_ping_interval). If the outbound
proxy fail to receive the reply message three times (ds_probing_threshhold)
in a row, it regards the internal SIP server as dead. With tr_timer, the
outbound proxy can correctly detect the status of an internal SIP server as
expected.
The internal SIP server is enforced to stop in my test environment.
Best regards,
Chen-Che
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