Re: [sipcore] Bypassing out-of-service intermediate Proxy

[Paul Kyzivat <[e-mail]>]

On 11/29/2010 1:42 AM, Christer Holmberg wrote:
> Hi,
>
>>> Not exactly the same case that Youssef is talking about, but every now and then I have had discussions that
>>> it would be useful to be able to re-negotiate the route set (not only the local/remote targets, but also the
>>> record-routes) during a dialog. E.g. in Outbound cases it could be used to move ongoing dialogs from a
>>> failed flow to another (it is not always possible to achieve it by using domain names and DNS).
>>>
>>> A problem is of course backward compability, becuase you would need to ensure that every intermediary
>>> that wants to remain in the route set inserts Record-Route in every re-INVITE/UPDATE (or whatever
>>> request is used to re-negotiate the route set).
>>>
>>> No, I did not suggest that we start work on such functionality :)
>>
>> We already have a way to do that: INVITE with Replaces.
>
> Sure, but that requires the establishment of a new session.
>
> Because I don't think it's allowd to send a re-INVITE, in order for a session to replace "itself", is it?

Yes, it requires establishment of a new session. But the new session 
could be identical to the old one. (E.g. the exact same media addresses, 
ports, and formats could be offered.)

	Thanks,
	Paul