[Sip-implementors] can conference participate know it is in conference state with some SIP method?

[wen ren]

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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