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

[[e-mail]]

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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