Re: [sipcore] About RFC3911(Join header)'s potential error:

Gao,

I think the works you are concerned about already are consistent with 
the scenario you raise. Specifically,

> and assign any mixing or conferencing resources necessary to complete the join

includes the case where no mixing or conferencing resources are necessary.

	Thanks,
	Paul

On 9/25/2010 10:27 PM, gao.yang2@zte.com.cn wrote:
>
> Hi,
>
> By section 4 of RFC3911(User Agent Server Behavior: Receiving a Join
> Header), UAS always create mixing or conferencing resources for
> authorized INVITE with Join header:
>
> If authorization is successful, the UA attempts to accept the new
> INVITE, and assign any mixing or conferencing resources necessary to
> complete the join.
>
> But I think it is not necessary, while it should depend on SDP's send
> and recv attribute.
>
> Let's consider a use case for IPTV system or VoD system:
> User_A connects to a vedio channel/file;
> User_A want to share this vedio with User_B synchronous, and shared the
> dialog information with User_B;
> User_B send INVITE with Join header to Join in the vedio
> broadcast/multicast;
>
> In fact, User_A and User_B all just have downlink media for the stream.
> So, the media server needn't create any mixing or conferencing
> resources. The server just need to duplicate the media stream to User_B.
>
> Thanks,
>
> Gao
>
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