Re: [Insipid] draft-ietf-insipid-session-id-10: comments

Paul Kyzivat <> Thu, 05 February 2015 17:36 UTC

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Subject: Re: [Insipid] draft-ietf-insipid-session-id-10: comments
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On 2/4/15 7:15 PM, Paul E. Jones wrote:
> Brett,

>> From an intermediary perspective, it is irrelevant why something on each
>> side decided to change the supplied UUID. My understanding is that the
>> draft requires (or will require) the intermediary to track the change so
>> that it MAY/SHOULD/MUST be used when the intermediary generates
>> (instead of
>> relays) subsequent requests and responses associated with the "session".
> That would be true of intermediaries like PBXes that are switching calls
> from one leg to another. It's only in situations where the intermediary
> is going to do something that causes endpoints to have the wrong value
> that they need to ensure they convey the right value.  If the SBC is not
> in the business of switching call legs from one device to another like a
> PBX does, it would not have to maintain this state at all.

I think *most* B2BUAs will sometimes need to originate messages. E.g.,
- send a BYE to terminate a session by policy
- send a session timer refresh.

Any B2BUA that will ever originate a message needs to maintain this state.

	Paul K