[Asterisk-Users] Announced Call Transfer

[Michael T Farnworth]

On Wed, 15 Oct 2003, Rich Adamson wrote:

> > > Michael T Farnworth wrote:
> > > 
> > > >more expensive phone in reception but leave the other people on the cheap 
> > > >Grandstream phones?
> > > >
> > > Yes, I have found the Snom200 does consultative transfers well..
> > > 
> > > >Couldn't this problem be solved with an asterisk upgrade?
> > > >
> > > No, Its an issue that is handled on the phone..
> > 
> > Perhaps I am confused, but I tend to believe that Asterisk sits in the
> > middle of all these calls.  So when I press the # key for transfer it
> 
> In many cases, that's a bad assumption, but it depends on your config.

As I said in the part of my original email which has been cut out:

"I suppose this would only be possible where the SIP phones weren't doing
a native bridge between themselves though."

> Unless you've purposefully configured something different, asterisk is
> "not" in the middle. Once a call is established, the communications
> (packet flows) happen directly between the two sip phones and does not
> pass through asterisk. So the problem becomes an issue of the phone
> itself. What has the phone been programmed to do when "any" key has
> been pressed (regardless of whether its the # key or something else)?

Certain parts of the operation must go via asterisk though even when there
is a native bridge, because when I press the # key asterisk starts to play
music to the other telephone and announces to the other phone that it is
about to do a transfer.  My question is whether more could be done at that
point to have an attended transfer.

> The discussion suggests the Grandstream phones have not been programmed
> to handle transfers. (I don't have one therefore I don't have a clue as
> to whether that happens to be the result of the vendor, or the person
> that has implemented the phone doesn't have the knowledge or documentation
> to do it.)

They have a transfer button and can do a blind transfer.  I am really 
looking for a way to convince Asterisk to do the following in a much 
easier way:

A calls B
B parks the calls from A
B puts down the phone and picks it up again and calls C
C says he/she will take the call
B tells C where the call is parked
C puts down the phone and picks up the phone and dials the parked call

or

A calls B
B parks teh call from A
B puts down the phone and picks it up again and calls C
C says he/she will not take the call
B puts down the phone and picks up the phone and dials the parked call

Michael