System, device, and method of voice-over-IP communication

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (a) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (b) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (c) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which increases RTP sequence number, on a particular candidate voiced frame, if a Zero Input Response (ZIR) of a Long Term Prediction (LTP) filter and a Linear Prediction Coefficient (LPC) filter, for said particular candidate voiced frame, is smaller than a Zero State Response (ZSR) of said LTP and LPC filters.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (a) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (b) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (c) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which increases RTP sequence number, on a particular candidate voiced frame, if a Zero Input Response (ZIR) of a Long Term Prediction (LTP) filter, for said particular candidate voiced frame, is smaller than a Zero State Response (ZSR) of said LTP filter.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (a) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (b) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (c) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which increases RTP sequence number, on a particular candidate voiced frame, if a Zero Input Response (ZIR) of a Linear Prediction Coefficient (LPC) filter, for said particular candidate voiced frame, is smaller than a Zero State Response (ZSR) of said LPC filters.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (A) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (B) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (C) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which decreases RTP sequence number, by performing:
• (a) checking if a Zero Input Response (ZIR) of a Long Term Prediction (LTP) filter and a Linear Prediction Coefficient (LPC) filter, for a particular voiced frame, is close by no more than 25 percent to a ZIR value of the frame immediately before said particular voiced frame;
• (b) if the checking result is positive, then:
• (i) discarding said particular voiced frame;
• and (ii) decreasing an RTP sequence number of the frame which is immediately after said particular voiced frame.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (A) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (B) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (C) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which decreases RTP sequence number, by performing:
• (a) checking if a Zero Input Response (ZIR) of a Long Term Prediction (LTP) filter, for a particular voiced frame, is close by no more than 25 percent to a ZIR value of the frame immediately before said particular voiced frame;
• (b) if the checking result is positive, then:
• (i) discarding said particular voiced frame;
• and (ii) decreasing an RTP sequence number of the frame which is immediately after said particular voiced frame.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (A) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (B) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (C) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• determining to perform RTP modification which decreases RTP sequence number, by performing:
• (a) checking if a Zero Input Response (ZIR) of a Linear Prediction Coefficient (LPC) filter, for a particular voiced frame, is close by no more than 25 percent to a ZIR value of the frame immediately before said particular voiced frame;
• (b) if the checking result is positive, then:
• (i) discarding said particular voiced frame;
• and (ii) decreasing an RTP sequence number of the frame which is immediately after said particular voiced frame.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (A) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (B) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (C) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• receiving from a local VoIP device, a multi-frame VoIP packet intended for transmission to the remote VoIP component;
• performing entropy decoding on the multi-frame VoIP packet, to generate multiple frames;
• placing the multiple frames into a local jitter buffer;
• performing RTP header modification on one or more of said multiple frames in said local jitter buffer;
• upon exit of said multiple frames from the local jitter buffer, performing entropy encoding on said multiple frames to generate a modified multi-frame packet;
• transmitting the modified multi-frame packet to the remote VoIP component over the IP network.

A method of Voice over Internet Protocol (VoIP) communication, the method comprising:

• receiving a data stream comprising a set of VoIP packets;
• and
• modifying a Real Time Protocol (RTP) header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the method comprises decreasing the jitter buffer delay of said data stream by performing:
• (A) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (B) decreasing a sequence number and a time-stamp in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (C) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the method comprises:
• receiving from a local VoIP device, a multi-frame VoIP packet intended for transmission to the remote VoIP component;
• performing range decoding on the multi-frame VoIP packet, to generate multiple frames;
• placing the multiple frames into a local jitter buffer;
• performing RTP header modification on one or more of said multiple frames in said local jitter buffer;
• upon exit of said multiple frames from the local jitter buffer, performing range encoding on said multiple frames to generate a modified multi-frame packet;
• transmitting the modified multi-frame packet to the remote VoIP component over the IP network.

An apparatus of Voice over Internet Protocol (VoIP) communication, the apparatus comprising:

• a jitter buffer to receive a data stream comprising a set of VoIP packets;
• and
• a Real Time Protocol (RTP) header modifier to modify an RTP header of at least one of said VoIP packets to modify a jitter buffer delay of said data stream, wherein the RTP header modifier is to decrease the jitter buffer delay by performing:
• (a) identifying a pair of consecutive packets in the incoming data stream, the pair of consecutive packets having consecutive sequence numbers;
• (b) decreasing a sequence number in an RTP header of at least a latter packet in said pair of consecutive packets, wherein the decreasing comprises:
• non-sequentially decreasing the sequence number in the RTP header by a natural number computed based on a target decrease in jitter buffer delay of a remote VoIP component to which a modified data stream is to be transmitted;
• (c) transmitting to the remote VoIP component the modified data stream which reflects packet deletion, to cause the remote VoIP component to skip a packet and to cause reduction of jitter buffer delay at the remote VoIP component;
• wherein the RTP header modifier is:
• (A) to receive from a local VoIP device, a multi-frame VoIP packet intended for transmission to the remote VoIP component;
• (B) to perform range decoding on the multi-frame VoIP packet, to generate multiple frames;
• (C) to place the multiple frames into a local jitter buffer;
• (D) to perform RTP header modification on one or more of said multiple frames in said local jitter buffer;
• (E) upon exit of said multiple frames from the local jitter buffer, to perform range encoding on said multiple frames to generate a modified multi-frame packet;
• (F) to transmit the modified multi-frame packet to the remote VoIP component over the IP network.