[Asterisk-Users] call waiting/ 3 way calling

[Eric Wieling aka ManxPower]

mohammad wrote:
> I have an Asterisk with 10 "SIP" ip-phones, our pbx features are now: Voicemail and Call Transfer.
> How can I serve both "Call Waiting / 3 way calling" for our SIP Phones.?/

This is what I call one of the "dirty little secrets of SIP".  On SIP 
phones (and H323) all the call control is done by the PHONE itself, not 
by the PBX.  Some SIP phones do not even support 3-way calling or 
supervised transfers (the BT101 comes to mind).  There really isn't 
anything Asterisk can do to make it work if the phone does not support 
the feature.

--Eric

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