[Asterisk-Users] X100P Call Waiting and Three Way Calling from SIP Device

[Ben Wern]

I'm trying to be able to access the call waiting and three-way calls 
features on a line attached to my X100P. For example, a party calls, the 
X100P/Asterisk ring the 7960 on my desk, and all is fine. If I want to three 
way call another individual in, I need to send a Flash to the X100P, and the 
7960 doesn't appear to have any way to to that mid-call. All I can come up 
with is transferring the call to a macro that will Flash, Dial the digits, 
and return the call to me. For example, _*4. points to:

[app-flash] 
exten => _*4.,1,Flash() 
exten => _*4.,2,SendDTMF(${EXTEN:2}) 
exten => _*4.,3,Flash() 
exten => _*4.,4,Transfer(1112)

This seems to work.. almost.. The flash, DTMF, and Flash commands work, 
becuase the party on the first Zap call can hear the party on the second Zap 
call. However, the Transfer back to the 7960 doesn't work, and after a few 
seconds the entire call is dropped. Any idea on what I'm doing wrong? Is 
there a simpler (in-call flash?) way to do this?

Ben Wern