A callee capability of "isfocus" on the contact header field of the far 
end tells you that it is a conference focus. E.g.

        Contact: sip:al...@atlanta.example.com;isfocus

Paul

wen ren wrote:
> hi, all
>      recently I am implement some complex features about conference. usually
> the conference master knows it is in
>      confernce state. But I want to let conference slave also konw it is in
> conference state. Does any SIP method,heads,
>      ,event package or parameters to send this indication to slave?
> thanks
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