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SIP (VoIP) Telephony Functions
Call waiting.
Call dial and hang-up.
Call hold.
Call transfer.
Pre-answer transfer of forwarded call.
Audio voice file playback.
In-band DTMF.
Out-of-band DTMF.
Auto answer (drive mode).
MESSAGE (SIMPLE) support.
Click-to-call from web browser.
Text drag-n-drop.
Dial from call history.
HA architecture (multi REGISTER server registration).
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