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Dean Willis | 5 Feb 2011 07:06
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Re: Changing route set in SIP outbound


On Jan 3, 2011, at 9:25 AM, Avshalom Houri wrote:

Assume that the first SIP proxy that is part of the route set (in SIP outbound)
crashes and immediately restarts, or a backup proxy takes over. Is there any way to keep the dialog alive if either of the
endpoints senses this failure and recreates a connection or the dialog is doomed and needs to be
fully recreated again? The issue is that the route set includes the connection information, which is no longer valid.


Well, if the proxies share credentials and an IP address by some HSRP-like magic, then the dialog might reasonably stay alive. This further requires either stateless operation or state sharing  ( embedded state; encoding it into the message headers is an example) between the proxies.

This is analogous to the route-set failover question in many a routing model: flow switching, MPLS, frame relay, ATM, or even Token-Ring. SIP has no magic to cure the fundamental issue. At best we can reduce it to a known problem.


--
Dean
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