Question:
I've got a problem with a TSP regarding drop of a conference call.

The conference is set up from an established first call by using lineSetupTransfer(), lineDial() and lineCompleteTransfer. After this I have three call handles to the first call, the inquiry call and the conference call. The calls have call states CONFERENCED (first call), CONFERENCED (inquiry call) and CONNECTED (conference call).

When I want to drop the conference I make lineDrop(hConfCall). I then expect three IDLE to come. In this case only one (first call) or, in some cases, two (first and conference call) IDLE come. It is then hard to decide if the conference is really dropped. One way of course is not to count IDLE and instead rely on the LINE_REPLY success message.

Anybody that has a better idea?

An extension to this question is: is it safe to trust a LINE_REPLY success message instead of checking the expected LINE_CALLSTATE?

Answer:
Your expectation that all three call handles should transit to idle is correct. If this is not the case I would regard it as a TSP issue. Have you reported it to the TSP manufacturer ?

In addition the dwAddrCapFlags member of the LINEADDRESSCAPS data structure may be of interest: LINEADDRCAPFLAGS_CONFDROP TRUE if lineDrop on a conference call parent also has the side effect of dropping (that is, disconnecting) the other parties involved in the conference call; FALSE if dropping a conference call still allows the other parties to talk among themselves.

An extension to this question is: is it safe to trust a LINE_REPLY - success - - - message instead of checking the expected LINE_CALLSTATE?

- - This depends entirely on the TSP that is used.

- - Your expectation that all three call handles should transit to idle - is - - correct. - - If this is not the case I would regard it as a TSP issue. - - Have you reported it to the TSP manufacturer ?

- - In addition the dwAddrCapFlags member of the LINEADDRESSCAPS data - structure - - may be of interest: - - LINEADDRCAPFLAGS_CONFDROP - - TRUE if lineDrop on a conference call parent also has the side - effect of - - dropping (that is, disconnecting) the other parties involved in the - - conference call; FALSE if dropping a conference call still allows - the other - - parties to talk among themselves.