asterisk users - Jan 2007 - Hanging up a 3-way conference when middle user hangs up

Apparently asterisk's default way to a 3-way conference lets the user
in the middle hangup and the other parties stay on the conversation.
This is great some times but it creates quite a bit of problems when
trunks dont have disconnect supervision or when trying to do
accounting and billing on the user.

Here is the 'normal' situation when a user tries the setup a 3 way
conference once the user is already on the phone with someone he
called.

1.  Press 'Flash' on the phone. Party B will now be placed on hold and
you will hear a dial tone.
2. Dial party C's number or a pre-configured speed dial followed by
'#', (you can engage in conversation).
3. Press 'Flash' to join both C and B to a single conference.
4. When you place the phone's handset on-hook, party B and party C
will remain in conversation.

After step 4, B and C remain on the conversation and I am looking for
a way to disable this without disabling 3 way calling.  Basically I am
looking for a way to force asterisk hang up both B and C once the
'middle' user hangs up so this will not leave channels stuck on trunks
without disconnect supervision.

Anyone know how to accomplish this?  Any comments appreciated.

How does this compare to using the conference features on a SIP phone,
say a Snom? I have used a Snom many times for an ad-hoc conference,
without any troubles...

PaulH

On Sun, 2007-01-07 at 18:12 -0600, Lex Lethol wrote:
> Apparently asterisk's default way to a 3-way conference lets the user
> in the middle hangup and the other parties stay on the conversation.
> This is great some times but it creates quite a bit of problems when
> trunks dont have disconnect supervision or when trying to do
> accounting and billing on the user.
> 
> Here is the 'normal' situation when a user tries the setup a 3 way
> conference once the user is already on the phone with someone he
> called.
> 
> 1.  Press 'Flash' on the phone. Party B will now be placed on hold
and
> you will hear a dial tone.
> 2. Dial party C's number or a pre-configured speed dial followed by
> '#', (you can engage in conversation).
> 3. Press 'Flash' to join both C and B to a single conference.
> 4. When you place the phone's handset on-hook, party B and party C
> will remain in conversation.
> 
> After step 4, B and C remain on the conversation and I am looking for
> a way to disable this without disabling 3 way calling.  Basically I am
> looking for a way to force asterisk hang up both B and C once the
> 'middle' user hangs up so this will not leave channels stuck on
trunks
> without disconnect supervision.
> 
> Anyone know how to accomplish this?  Any comments appreciated.
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