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ITU-T Recommendation G.722.1:. The RTP Packetization Steve Casner (CISCO) for A. Crossman (PictureTel) [email protected] Overview. ITU-T standard approved in Sept. 1999 Wideband 50Hz - 7kHz Two rates: 24kbit/s or 32kbit/s Low complexity, < 15MIPS 20ms frames (60 or 80 octets/frame)

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Itu t recommendation g 722 1

ITU-T Recommendation G.722.1:

The RTP Packetization

Steve Casner (CISCO)

for

A. Crossman (PictureTel)

[email protected]


Overview
Overview

  • ITU-T standard approved in Sept. 1999

  • Wideband 50Hz - 7kHz

  • Two rates: 24kbit/s or 32kbit/s

  • Low complexity, < 15MIPS

  • 20ms frames (60 or 80 octets/frame)

  • Quality equivalent to ITU-T G.722


Mapping g 722 1 into rtp octets

first bit

transmitted

last bit

transmitted

sequence (for one frame) of bits (480 or 640) output by encoder

msb… lsb

msb… lsb

msb… lsb

msb… lsb

msb… lsb

RTP octet 1

RTP octet 2

RTP octet 3

RTP octet 60 or 80

Mapping G.722.1 into RTP Octets


Rtp payload format
RTP Payload Format

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| RTP Header [see RFC 1889] |

+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+

| |

+ one or more frames of G.722.1 |

| .... |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


Issues
Issues

  • ITU-T approved same H.323/RTP packet format in Feb. 2000

  • Typos in this draft resulted after submission to IETF - includes badly formatted references

  • Notify author of inconsistencies/typos etc.


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