Hi all,

 

Question:

 

Discussion:

 

I have got an IMS scenario, where I think the destination blacklist is not working and try to find the reason.

 

I use UDP between two Kamailio SIP Proxies (P-CSCF and S-CSCF) and send a SIP request to the primary instance of the S-CSCF.

 

However the destination Kamailio has been stopped with kamctl stop before and so the destination machine responds with ICMP “Destination Unreachable”. DNS Failover towards secondary S-CSCF instance works perfectly.

 

Destination Blacklist does not work. I.e. the next SIP Request is sent to the primary host again, before failover to secondary host applies. I would have expected the request would be sent to secondary host immediately.

 

From the description in doc/dst_blacklist.txt

[…] A destination is added to the blacklist when an attempt to send to it fails (e.g.

timeout while trying to send or connect on TCP), or when a SIP timeout occurs

while trying to forward statefully an INVITE (using tm) and the remote side

doesn't send back any response.[…]

 

I think the destination blacklist does not work, because an ICMP Response “Destination Unreachable” is received.

 

Second question:

 

Thanks, Christoph




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