Subject: RE: [Sip] Record routing primary and secondary locations

From: Jonathan Rosenberg <[email-masked]>
Date: Wed, 28 Nov 2001 01:20:32 -0500

> -----Original Message-----
> From: Brett Tate [mailto:[email-masked]]
> Sent: Thursday, October 25, 2001 5:24 PM
> To: sip-ietf (E-mail)
> Subject: [Sip] Record routing primary and secondary locations
> 
> 
> Hi,
> 
> At various times on this list people have 
> alluded to the various possibilities to 
> help ensure that a request can traverse a 
> route for an established call-leg even 
> when a proxy is down.  Has such 
> functionality been capture in an IETF 
> draft?  If so, which one?

Proxies can record-route with SIP URLs.

The specification defines procedures for failure handling when trying to
contact a SIP URL. Therefore, I believe that to be sufficient. Generally,
this means a DNS based approach. There are failover approaches that are
dns-less as well, using IP routing techniques, and these also work. However,
none of them are specific to the record-routing, and I don't think that
specifying a mechanism specific to record-route is a good thing.

-Jonathan R.
---
Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
[email-masked]                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com

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