Method and apparatus for eliminating false voice detection in voice band data service

An apparatus for eliminating false detection in a Voice Over Internet Protocol (VOIP) service supporting a voice band data mode and a voice mode, the apparatus comprising:

• a communications bus carrying voice band signals associated with a VOIP call;
• a silence detector coupled to the communications bus configured to (i) detect silence on the bus and (ii) enable in voice band data mode;
• a voice detector coupled to the bus configured to (i) detect voice on the bus, (ii) initially disable the detection of the voice band signals in voice band data mode, (iii) while remaining in the voice band data mode with the silence detector enabled to detect silence on the bus, enable voice detection in response to the silence detector's detecting silence for a predetermined length of time, and (iv) monitor the voice band signals after being enabled;
• and
• a processor, coupled to the silence detector and the voice detector, that terminates voice band data mode and enters voice mode in response to the voice detector's detecting voice on the communications bus.

A computer-readable medium having stored thereon sequences of instructions, the sequences of instructions, when executed by a digital processor, cause the processor to:

• for a Voice Over Internet Protocol (VOIP) call, enable silence detection and disable voice detection from detecting a voice band signal in voice band data mode;
• monitor a voice band signal associated with the VOIP call for silence;
• while remaining in the voice band data mode with silence detection enabled, in response to detecting silence for a predetermined length of time, enable voice detection;
• if voice detection is enabled, monitor the voice band signal for voice;
• and
• in response to detecting voice, terminate voice band data mode and enter voice mode.

An apparatus for eliminating false detection in a Voice Over Internet Protocol (VOIP) service supporting a voice band data mode and a voice mode, the apparatus comprising:

• means for enabling silence detection and disabling voice detection from detecting a voice band signal for a VOIP call in voice band data mode;
• means for monitoring a voice band signal associated with the VOIP call for silence;
• means for enabling voice detection in response to detecting silence for a predetermined length of time while remaining in the voice band data mode with silence detection enabled;
• means for monitoring the voice band signal for voice if voice detection is enabled;
• and
• means for terminating voice band data mode and entering voice mode in response to detecting voice.