H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/22 (2006.01) H04W 80/10 (2009.01) H04L 27/26 (2006.01)
Patent
CA 2721475
In a third party call control system, a controller sends a command to a PBX for causing the PBX to initiate setup of a call leg between the PBX and a telephone device. The PBX responsively places a telephone call to the telephone device and sends an indicator to the controller that the call is in a ringing state. Responsive to the indicator, the controller subscribes with the PBX for event notification of DTMF tones from the telephone device for verifying the setup of the call leg. Configuration of the PBX for providing the desired event notification to the controller may thus be completed before any DTMF tones arrive at the PBX. This may be true even if an audio channel of the telephone call is established before the PBX receives any indication that the call was answered. Verification of call leg setup by the controller may thus be facilitated.
Gupta Abhinav
Siddique Gibran
Research In Motion Limited
Smart & Biggar
LandOfFree
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