In, a spiral is
RFC 3261, section 6
a SIP request that is routed to a proxy, forwarded onwards, and arrives once again at that proxy, but this time differs in a way that will result in a different processing decision than the original request. Typically, this means that the request's differs from its previous arrival. A spiral is not an error condition, unlike a loop. A typical cause for this is call forwarding. A user calls [email protected]. The example.com proxy forwards it to Joe's PC, which in turn, forwards it to [email protected]. This request is proxied back to the example.com proxy. However, this is not a loop. Since the request is targeted at a different user, it is considered a spiral, and is a valid condition.
Excerpts from RFCs and Internet Drafts:
Copyright © The Internet Society. All Rights
All other material is copyrighted by the contributing authors and licensed to the public under the GNU Free Documentation License (GFDL).
For more information, please see the Copyright page.