[asterisk-dev] SIP Phone Conference from Asterisk.

[md]

Hi,
Is possible put in conference a sip phone where there are two calls (one active and the other held) from Asterisk? Is there any SIP header to activate the conference in a SIP phone remotly?

El escenario es:

1. SIP A calls SIP B: call 1
2. SIP A calls SIP C: call 2 --> call 1 held; call 2 active
3. ASTERISK APPLICATION notify SIP A for put call 1 and call 2 in conference.

Is the step 3 possible? Is there any SIP header to indicate to a SIP phone 
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