Am Donnerstag, 30. August 2012 07:43:20 UTC+2 schrieb uni...@gmail.com
> I am experimenting with a USB GSM Modem (Prolink phs300) which has GSM voice call support. From the user interface of it's bundled utility software I can make calls and receive calls.
> I want to build a TAPI application to make GSM calls using this modem.
> What the output program does is that it creates a dialog and says "lift receiver and click talk" and it disappears in 2 seconds and terminates. The call even does not succeed to reach the other end (destination number.) When using atd command with realterm the call reaches the destination but with 'at' commands I don't know how to establish voice channel.
with voice/modem specific AT commands I can't help unfortunately.
You may want to contact the manufacturer directly on this if they are not specified in the manual.
Or you can try to monitor the communication via USB / COM port while using the bundled utility software...
The "lift receiver and click talk" message box is created by MS UniModem TSP.
This usually happens when the modem isn't properly installed as voice modem (from TAPI's perspective) but only recognized as data modem.
You may want to try 1st if the voice support is actually available via TAPI- and maybe not only directly via specific AT commands etc.
If you have an old Win XP installation at hand you can use its Dialer application (TAPI3 based) to make voice calls (if supported by the device and driver via TAPI). Unfortunately this Dialer has been replaced in later OS with one that only supports call control (via TAPI2) but no media anymore.
On Win XP you can also use the MS TAPI Browser for TAPI3 TB3x.exe for further testing.
With current Windows oS you can try with a TAPI2 app if you can reach the destination at all via TAPI. You can try with JulMar Phone.exe (recommended for its UI), MS TAPI Browser for TAPI2 TB20.exe (recommended for its complete feature set / API support), or MS Dialer.exe (TAPI2 based, comes with the OS but not really recommended because of poor features and poor feedback).
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