Method and apparatus for transmitting frequency shift key data in a packetized format

A system for handling frequency shift key (FSK) data of a voiceband data communication to pass through an Internet Protocol (IP) network, the system comprising:

• means for identifying the FSK data;
• means for determining that the FSK data is to be transmitted through the IP network separate from a voice stream for the voiceband data communication;
• means for encoding the FSK data as a binary representation;
• means for packetizing the encoded FSK data within Real-Time Transport Protocol (RTP) data packets, each RTP data packet including a header portion with a payload type identifying a redundancy scheme and a payload portion with at least one RTP payload, each RTP payload comprising a bit count, an end of data bit, an FSK data block, and a pad, the RTP data packet includes a first data packet with a first primary FSK data block, a second data packet with a second primary FSK data block and a first redundant FSK data block, a third data packet with a third primary FSK data block and the first redundant FSK data block and a second redundant FSK data block;
• and,
• means for transmitting the packetized FSK data in the RTP data packets out-of band from transmission of voice packets associated with the voice stream, wherein the RTP data packets are multiplexed with the voice packets.

A data format for a voiceband data communication including a voice stream and frequency shift key (FSK) data, comprising:

• a Real-Time Transport Protocol (RTP) header portion with a payload type identifying a redundancy scheme;
• and,
• a Real-Time Transport Protocol (RTP) payload portion with at least one RTP payload, each RTP payload comprising a bit count, an end of data bit, an FSK data block, and a pad, wherein each FSK data block comprises frequency shift key (FSK) data separated from the voice stream for the voiceband data communication;
• wherein the RTP header and RTP payload portions form an RTP data packet for transmission out-of-band from voice packets associated with the voice stream in a multiplexed fashion in relation to transmission of the voice packets, the RTP data packet includes a first data packet with a first primary FSK data block, a second data packet with a second primary FSK data block and a first redundant FSK data block, a third data packet with a third primary FSK data block and the first redundant FSK data block and a second redundant FSK data block.

An apparatus, comprising:

• a digital loop carrier (DLC) receiving a voiceband data communication including a voice stream and frequency shift key (FSK) data;
• and
• a multimedia terminal adapter (MTA) in operative communication with the DLC via an internet protocol network;
• wherein the DLC transmits the voiceband data communication to the MTA by separating the FSK data from the voice stream, encoding the FSK data as a binary representation, packetizing the encoded FSK data using a real-time transport protocol (RTP) to form RTP data packets, and transmitting the RTP data packets out-of-band from transmission of voice packets associated with the voice stream, the RTP data packets being multiplexed with the voice packets;
• wherein each RTP data packet includes a header portion with a payload type identifying a redundancy scheme and a payload portion with at least one RTP payload, each RTP payload comprising a bit count, an end of data bit, an FSK data block, and a pad, each FSK data block including at least a portion of the FSK data from the voiceband data communication, the RTP data packet includes a first data packet with a first primary FSK data block, a second data packet with a second primary FSK data block and a first redundant FSK data block, a third data packet with a third primary FSK data block and the first redundant FSK data block and a second redundant FSK data block.