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 connection information, which is no longer valid.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
_______________________________________________
Sip mailing list https://www.ietf.org/mailman/listinfo/sip
This list is essentially closed and only used for finishing old business.
Use [email protected] for questions on how to develop a SIP
implementation.
Use [email protected] for new developments on the application of sip.
Use [email protected] for issues related to maintenance of the core SIP
specifications.
