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Adding Support for Phone Message Recording and Playback

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Adding support for phone message recording and playback requires the definition of the AT commands that control these functions. The following table describes the voice modem INF file entries that define the AT commands for phone message recording and playback.

INF File Entry Command Description

AbortPlay

Stops playing audio data immediately (does not play the rest of the audio buffer contents). This command is needed for modems that are using a serial wave device.

CloseHandset

Resets the modem to Class 0.

HandsetSetPlayFormat

Sets the modem's handset playback format.

HandsetSetRecordFormat

Sets the modem's handset recording format.

LineSetPlayFormat

Sets the modem's line playback format.

LineSetRecordFormat

Sets the modem's line recording format.

OpenHandset

Puts modem in a mode that enables audio to be played back through the handset when there is no active call.

StartPlay

Starts playing audio (.wav files) through the modem. If a serial wave driver is being used, a bit in the VoiceProfile entry determines if the baud rate is set prior to, or after, the StartPlay command is issued.

StartRecord

Starts recording audio (.wav files) from the modem. If a serial wave driver is being used, a bit in the VoiceProfile file determines if the baud rate is set prior to, or after, the StartRecord command is issued.

StopPlay

Resets the modem's baud rate after an AbortPlay or TerminatePlay command is issued. A bit in the VoiceProfile entry indicates whether Unimodem has to reset the UART's baud rate.

StopRecord

Stops recording audio (.wav files) from the modem. If a serial wave driver is being used, a bit in the VoiceProfile entry determines whether the baud rate is set before or after the StopRecord command is issued.

TerminateRecord

Directs the modem to finish recording its local buffer and stop recording audio data. This command is needed for modems with a serial wave device.

TerminatePlay

Directs the modem to finish playing the contents of its local buffer and stop playing audio data after that. This command is needed for modems that have a serial wave device.

 

The following example demonstrates these entries:

    HKR, CloseHandset,            1,, "at#cls=0<cr>"
    HKR, StartPlay,               1,, "at#vtx<cr>"
    HKR, StopPlay,                1,, "None"
    HKR, StopPlay,                2,, "NoResponse"
    HKR, StartRecord,             1,, "at#vrx<cr>"
    HKR, StopRecord,              1,, "None"
    HKR, StopRecord,              2,, "NoResponse"
    HKR,, TerminateRecord,,       "!"
    HKR,, TerminatePlay,,         "<h10><h03>at<cr>"
    HKR,, AbortPlay,,             "<h10><h18>at<cr>"
    HKR, LineSetPlayFormat,       1,, "at#vls=0<cr>"
    HKR, LineSetRecordFormat,     1,, "None"
    HKR, LineSetRecordFormat,     2,, "NoResponse"
    HKR, HandsetSetRecordFormat,  1,,"at#vsr=7200<cr>"
    HKR, HandsetSetRecordFormat,  2,,"at#vbs=4<cr>"
    HKR, HandsetSetPlayFormat,    1,,"at#vsr=7200<cr>"
    HKR, HandsetSetPlayFormat,    2,,"at#vbs=4<cr>"
    HKR, OpenHandset,             1,, "at#cls=8<cr>"
    HKR, OpenHandset,             2,, "at#vls=2<cr>"

For more information about these voice modem INF entries, see Voice Modem INF File Entries.

 

 

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