On Oct 17, 2008, at 12:21 PM, Paul Kyzivat wrote:
Dean Willis wrote:
Here's a question:
A UA has registered two flows to one instance. It has one gruu. The
UA uses the gruu as the contact in a dialog-forming request.
An in-dialog request (for example, BYE) is sent back to the UA. On
which flow does it get routed?
From gruu-15:
1. The client is using draft-ietf-sip-outbound [13] and registering
multiple contacts for redundancy. In that case, these contacts
contain reg-id Contact header field parameters, and the rules
described in Section 7 of draft-ietf-sip-outbound [13] for
selecting a single registered contact apply.
Not helpful; section 7 refers to out-of-dialog request forwarding.
What happens to in-dialog requests?
The request references a gruu.
A pre-outbound gruu is bound to one and only one contact, so the
request-URI transformation rule is obvious; transform the request-URI
using the contact associated with the gruu. This behavior is specified
in 6.1 of the gruu draft. Oddly enough, that text in gruu-6.1 replaces
the request-URI with "the registered contacts" (note the plural). Not
sure that makes sense. Somebody tell me if that's a bug in gruu.
An outbound-compliant gruu is bound to one and only instance, but an
instance can have multiple contacts.
I think what has to happen to make it work is fairly obvious, but it
isn't documented anywhere I can find.
There's some hinting at it in outbound-5.3.2, but inly from the
perspective of the edge proxy. What has to happen at the home proxy to
make this work?
--
Dean
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