[OpenSIPS-Users] DNS SRV failover not working for B2BUA (1.10)

[Jeff Pyle]

Hello,

I have an SRV name as follows:

$ dig +short -tSRV _sip._udp.proxyname.domain.com
1 10 5060 host1.domain.com.
2 10 5060 host2.domain.com.

If I t_relay() a request with proxyname.domain.com as the request domain,
and host1 does not answer within fr_timer seconds, the request is
re-relayed to host2.  This is good.

If I b2b_init_request("top hiding") instead of t_relay(), the 408 is
forwarded back towards the UAC after host1 doesn't answer.  The request is
never re-relayed to host2.

There is a difference in the debug output after the 408 is generated for
host1.  With the B2BUA it looks like is_3263_failure() never happens.

t_relay:
Nov 26 09:03:38 [16296] DBG:tm:timer_routine: timer
routine:0,tl=0x7fbe6c7c0060 next=(nil), timeout=61
Nov 26 09:03:38 [16296] DBG:tm:final_response_handler: Cancel sent out,
sending 408 (0x7fbe6c7bfe10)
Nov 26 09:03:38 [16296] DBG:tm:t_should_relay_response: T_code=100,
new_code=408
Nov 26 09:03:38 [16296] DBG:tm:t_pick_branch: picked branch 0, code 408
(prio=800)
Nov 26 09:03:38 [16296] DBG:tm:is_3263_failure: dns-failover test:
branch=0, last_recv=408, flags=1
Nov 26 09:03:38 [16296] DBG:tm:t_should_relay_response: trying DNS-based
failover
Nov 26 09:03:38 [16296] DBG:tm:do_dns_failover: new destination available
Nov 26 09:03:38 [16296] DBG:core:check_ip_address: params 127.0.0.1,
127.0.0.1, 0
Nov 26 09:03:38 [16296] DBG:tm:set_timer: relative timeout is 500000

b2b_init_request:
Nov 26 09:12:21 [16401] DBG:tm:timer_routine: timer
routine:0,tl=0x7f09ddcbf7e8 next=(nil), timeout=11
Nov 26 09:12:21 [16401] DBG:tm:final_response_handler: Cancel sent out,
sending 408 (0x7f09ddcbf598)
Nov 26 09:12:21 [16401] DBG:tm:t_should_relay_response: T_code=0,
new_code=408
Nov 26 09:12:21 [16401] DBG:tm:t_pick_branch: picked branch 0, code 408
(prio=800)
Nov 26 09:12:21 [16401] DBG:tm:local_reply: branch=0, save=0, winner=0
Nov 26 09:12:21 [16401] DBG:tm:local_reply: local transaction completed
Nov 26 09:12:21 [16401] DBG:tm:run_trans_callbacks: trans=0x7f09ddcbf598,
callback type 256, id 0 entered
Nov 26 09:12:21 [16401] DBG:b2b_entities:b2b_tm_cback: tm [0x7f09ddcbf598]
notification cb for [408] reply
Nov 26 09:12:21 [16401] DBG:b2b_entities:b2b_parse_key: hash_index = [472]
 - local_index= [2611231]
Nov 26 09:12:21 [16401] DBG:b2b_entities:b2b_tm_cback: Received reply [408]
for dialog [0x7f09ddcbf2b8], method [INVITE]

Is there something extra that must occur in the script to get DNS failover
behavior with the B2BUA?  Or, is this a bug?


Regards,
Jeff
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