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List:       sip-implementors
Subject:    RE: [Sip-implementors] Alternate Route
From:       "Brett Tate" <brett () broadsoft ! com>
Date:       2003-06-24 15:00:43
Message-ID: 000001c33a61$636bbe30$2b01a8c0 () broadsoft ! com
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> Is there a mechanism to specify alternate Route? 
> 
> RFC 3261, explains how to use a pre-existing 
> route set.   Consider the following,
> 
> Client A ----> Proxy P1 --------->Proxy P2 -----> Client C.
> 
> Client A has Route set as  Route : P1, P2.  
> Then the request is routed through P1 and P2.  
>
> For some reason if P1 is not able to reach P2, 
> then the request has to be routed to P3.  
> How to specify this in the Route set?  

There is no explicit mechanism within the
Route header.  However RFC 3263 provides
an SRV mechanism which can be used to
achieve your desired results.  Unfortunately
there is not an easy way to communicate
a time interval or retry count for the
target advancing.  However an ICMP error 
can trigger the advancing in a more timely
manor.

RFC 3261 section 16.6 step 7 discusses trying
multiple addresses based upon RFC 3263.

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