[OpenSIPS-Users] Detect failed SIP server

[microx]

Hi Bogdan-Andrei,

In my test environment, an outbound proxy forwards each received message
from UA to an internal SIP proxy server.
The SIP proxy server sends the message back to the outbound proxy after the
proxy server processed the message. 
As you said, the SIP proxy server returns 100 try to the outbound proxy when
receiving an INVITE (the message flow is shown below). So fr_timer should be
replaced with fr_inv_timer (but I leave the fr_inv_timer to default).
Anyway, after I modified my configuration to 
modparam("tm", "fr_timer", 10) 
modparam("tm", "fr_inv_timer", 32) 
modparam("tm", "fr_timer_avp", "$avp(timeout)") 
modparam("tm", "fr_inv_timer_avp", "$avp(intimeout)")
route { 
$avp(timeout) = 32;
$avp(intimeout)=32;
!t_relay(); 
} 
nothing changes. A caller remains to receive 408 request timeout after 10
seconds. I did lookup this forum but couldn't find directly related threads.
Please help me address this issue. Thanks so much.

Best regards,
Chen-Che

            INVITE
1. caller--------->outbound proxy-------proxy server
             100 try
2. caller<--------outbound proxy-------proxy server
                                               INVITE
3. caller----------outbound proxy--------->proxy server
                                                100 try
4. caller----------outbound proxy<---------proxy server
                                                INVITE
5. caller----------outbound proxy<---------proxy server
                                                INVITE
6. caller----------outbound proxy--------->proxy server
.
.
.                
                                               408 timeout
n. caller----------outbound proxy--------->proxy server
                                               408 timeout
n+1. caller----------outbound proxy<-----------proxy server
             408 timeout
n+2. caller<--------outbound proxy-----------proxy server



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