[Freeswitch-users] 482 Request merged, in serial forking

[Humberto Quintana]

Hello,

I'm a new Freeswitch user. After some reading I put Freeswitch (Version 1.0.4) to work as Session Border Controller.  I have only one problem that I dont know how to solve it ( or which parameter to set) and I'd appreciate if someone could give me a clue about this. 

Kamailio is sitting behind FS and it selects the route or routes in case of failure (serial forking) .  Freeswitch is configured to use directly the Request-URI sent by Kamailio.

So, when the 1st route fails, Kamailio receives the Reply from FS and sends back the ACK to end the transaction.  More than 1 second later, a new INVITE from Kamailio with the next route is tried (With the To-header's tag is empty. Same Callid, From and Cseq header but different VIA-header's branch parameter) and FS is answering back 482 Merged Request.  It happens the same for the 3rd route.

It seems that the transaction is still 'alive' in FS even if the ACK was received ?


Thanks,

Humberto


===1st route===

U 2009/09/03 17:20:36.069147 kamailio -> freeswitch
INVITE sip:5145555555 at gw1 SIP/2.0.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.0
Call-ID: 1

U 2009/09/03 17:20:36.169147 freeswitch -> gw1
INVITE sip:5145555555 at gw1 SIP/2.0.
Call-ID: 2

U 2009/09/03 17:20:36.170158 gw1 -> freeswitch
SIP/2.0 100 Trying.
Call-ID: 2

U 2009/09/03 17:20:36.190457 gw1 -> freeswitch
SIP/2.0 503 Service Unavailable.
Call-ID: 2

U 2009/09/03 17:20:36.193296 freeswitch -> gw1
ACK sip:5142776756 at gw1 SIP/2.0.
Call-ID: 2

U 2009/09/03 17:20:36.227492 freeswitch -> kamailio
SIP/2.0 503 Service Unavailable.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.0
Call-ID: 1

U 2009/09/03 17:20:36.228122 kamailio -> freeswitch
ACK sip:5145555555 at gw1 SIP/2.0.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.0
Call-ID: 1


===2nd route===
U 2009/09/03 17:20:37.596885 kamailio -> freeswitch
INVITE sip:15145555555 at gw2:5061 SIP/2.0
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.1
Call-ID: 1

U 2009/09/03 17:20:37.597590 freeswitch -> kamailio
SIP/2.0 482 Request merged.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.1
Call-ID: 1

U 2009/09/03 17:20:37.598163 kamailio -> freeswitch
ACK sip:15145555555 at gw2:5061 SIP/2.0.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.1
Call-ID: 1


===3rd route===
U 2009/09/03 17:20:37.642098 kamailio -> freeswitch
INVITE sip:5145555555 at gw3 SIP/2.0
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.2
Call-ID: 1

U 2009/09/03 17:20:37.642634 freeswitch -> kamailio
SIP/2.0 482 Request merged.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.2
Call-ID: 1

U 2009/09/03 17:20:37.643139 kamailio -> freeswitch
ACK sip:5145555555 at gw3 SIP/2.0.
Via: SIP/2.0/UDP kamailio;branch=z9hG4bKa0fa.0cd8784.2
Call-ID: 1


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