Patent ID: 7743164

Claim:
A method for handling frequency shift key (FSK) data of a voiceband data communication to be passed through an Internet Protocol (IP) network, the method comprising: identifying the FSK data; determining that the FSK data is to be transmitted through the IP network separate from a voice stream for the voiceband data communication; encoding the FSK data as a binary representation; 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, 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.