Re: [OpenSBC] SipX<=>OpenSBC: inbound route doesn't work

[OpenSBC F. <ope...@op...>]

Threading was screwed up in the OSS Forum so I am reposting this:

Hi Robert,

OpenSBC can do hairpin if you do it correctly.  The outbound call should 
be sent through the main trunk

UA1 -> OSBC-Main-Trunk -> SIP-Server

When the SIP-Server hairpins/trombones the call back to OpenSBC, it must 
either use one of two listeners based on which config applies

** SIP-Server has static routing policies OR is configured as upper-reg
SIP-Server -> OSBC-BackDoor -> OSBC-Main-Trunk -> UA2

Or

** SIP-Server configured as a trunk provider
SIP-Server -> OSBC-SIP-Trunk -> OSBC-Main-Trunk -> UA2

In the case of the original poster, he is trying to trombone the call 
back to the SIP-Trunk which would cause call-id collisions

Joegen