[asterisk-users] Restricting transfers between SIP phones

[Benny Amorsen]

"C. Chad Wallace" <cwallace at lodgingcompany.com> writes:

> So, does anyone know of a way to detect whether a call from a SIP phone
> is the first step of an attended transfer or an original call?  

This is impossible. At that point the phone has done this:

1) Put the original caller on hold
2) Made a new outgoing call

At some future point the phone might drop the second outgoing call and
go back to the first, or it might bridge the two in a transfer. You
can't know in advance.

The only way to achieve what you want is to never allow a call to a
different department when the same phone already has a call on hold.
This will however stop the (in some places quite common) practice of
calling the other department to ask a quick question, then returning to
the original caller.

It could be somewhat tricky to implement as well, but it should be
doable with call-groups.


/Benny