[OpenSIPS-Users] confusion about the reply route and the failure route

[Răzvan Crainea]

On 11/21/19 4:17 PM, Ben Newlin wrote:
> "Moreover, in failure route you can only drop a reply, but you cannot failover."
> 
> I think this should say in reply route.
That is correct, my apologies, you can only drop a response in reply_route.
> 
> Ben Newlin
> 
> On 11/21/19, 3:56 AM, "Users on behalf of Răzvan Crainea" <users-bounces at lists.opensips.org on behalf of razvan at opensips.org> wrote:
> 
>      Hello!
>      
>      By default, the replies received by OpenSIPS are relayed further,
>      whether you have a reply of failure route or not. The purpose of these
>      two routes is to do any processing on the messages they are processing.
>      Note that the scope of failure route and reply route is a bit different:
>      the reply route is ran for each reply message - this means that if you
>      for example add a header on a 408, that 408 message will contain the
>      header. Moreover, in failure route you can only drop a reply, but you
>      cannot failover.
>      The failure route has nothing to do with replies processing - it is ran
>      in the context of the initial request. This means that if you add a
>      header in failure route, it will not appear in any replies! However, if
>      you run t_relay() in failure route, you will create a new branch - send
>      the request to a new upstream - that request will contain the added
>      header. The only thing that failure route running relates to replies is
>      the fact that if you do a t_relay() in failure route and dispatch the
>      request to a new destination, no reply will be sent downstream.
>      To summarize, if you don't use reply route or failure route, all
>      responses will be sent. The only exception to this rule is when you use
>      parallel forking: send the initial request to multiple destinations in
>      parallel. In such case, according to RFC 3261, OpenSIPS will only relay
>      downstream the result all replies received from upstream - that is the
>      lowest terminal response code.
>      
>      Best regards,
>      Răzvan
>      
>      
>      On 11/21/19 4:30 AM, 汤世祥 wrote:
>      > Hi:
>      >      I'm a little confused about the reply route and the failure route.
>      >       Both can handle 404/408 responses in invite session. Both default action is to relay back the SIP reply.
>      >         If I omit two routes in scripts(that meas not arm the reply route by using the t_on_reply("name") function or t_on_failure("name") function) or call t_relay() in these two routing scripts, will there be two responses sent ?
>      >
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>      >
>      
>      --
>      Răzvan Crainea
>      OpenSIPS Core Developer
>         http://www.opensips-solutions.com
>      
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>      
>      
> 
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-- 
Răzvan Crainea
OpenSIPS Core Developer
   http://www.opensips-solutions.com