Re: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking

On 8/4/13 6:57 PM, Christer Holmberg wrote:
> Hi,
>
>>> As I indicated at the STOX session (and was later repeated by Jonathan Lennox), the draft need to have a story on SIP forking, e.g. if what happens if the INVITE sent from the interworking node gets forked, and multiple early dialogs are created.
>>
>> I'll propose text but in general terms, since forking doesn't exist in XMPP, the gateway will need to make sure only one reply is relayed to the XMPP side. Also, there dis very little text about early media in XEP-166, I'll look more into that.
>
> Unfortunately my XMPP knowledge is more or less zero, so at this point I can't really suggest any solution.

Me too.

> However, if early media does not exist in XMPP, and the gateway only needs to care about (at least from a media perspective) the 200 OK, there probably is no problem :)

I'm not sure what it means for early media to not exist in XMPP, or the 
implications of that on an XMPP-SIP GW. If the session is being 
originated from XMPP, and media addresses are provided before the call 
is answered, then early media is possible, even if it will be ignored.

The only way I can see to avoid this entirely is for the GW to initiate 
the initial INVITE without an offer, and *not* support 100rel, so that 
the answer won't be sent until the ACK.

	Thanks,
	Paul

> Regards,
>
> Christer
>
>
>
>
> _______________________________________________
> stox mailing list
> stox@ietf.org
> https://www.ietf.org/mailman/listinfo/stox
>