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

Paul,

IMO, no matter the original concept of RFC3911 is always create mixing or 
conferencing resources, or it depends on SDP attributes(as I showed in the 
IPTV scenario), the UAS's behavior for INVITE with Join header is not quit 
correct/clear by current text in RFC3911.

The UAS's behavior in the IPTV scenario is my understanding. It seems that 
you have the similar understanding(that's nice). 

But there's people said that this is not defined in the RFC3911, once in 
one discussion. Though I think my/our understanding is reasonable, but I 
admit that RFC3911 really hasn't do such definition.

And if the Join INVITE with less or more media streams(m= lines), how 
would the UAS behave as? I think this also not clear now.

Thanks,

Gao

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Paul Kyzivat <pkyzivat@cisco.com> 
2010-09-27 21:35

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gao.yang2@zte.com.cn
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"sipcore@ietf.org" <sipcore@ietf.org>
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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
>
> ===================================
> Zip : 210012
> Tel : 87211
> Tel2 :(+86)-025-52877211
> e_mail : gao.yang2@zte.com.cn
> ===================================
>
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