prevent handshaking

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Hello,
I design a program to answer voice calls,By using
AT commands it works fine for all type of modems,
But using tapi only voice modems works, DataModems
which not support mediamode_interactivevoice
generates a handshaking noise when use lineAnswer()
is there a way to avoid this handshaking noise?

I want to explain why i have to use TAPI instead of
AT command, because AT commands make the modem
busy, so the user can't use the internet until
he shutdown the program uses the comm port, which
not happed when Using Tapi, is there a way to
get around this problem ?

Saber,

.

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