User`s guide

24 Dialogic
®
Host Media Processing Software Release 4.1LIN Release Guide
Features
3.10 Codecs for RTP Interface
This section describes supported audio codecs and video codecs for RTP.
Audio Codecs for RTP
Supported audio codecs for RTP include:
• G.711 – 64 kbps format, mu-law and A-law, at 10, 20, or 30 ms frames
• G.723.1 – 5.3 and 6.3 kbps, 30 ms frames, and 1, 2 or 3 frames per packet
• G.726 – 16, 24, 32 and 40 kbps
– 20 ms frame size, 1, 2, or 3 frames per packet
• G.729A (compatible with G.729 format) – 8 kbps, 10 ms frames, and 2, 3, or 4 frames
per packet
• G.729AB (compatible with G.729B format) – 8 kbps, 10 ms frames, and 2, 3, or 4
frames per packet
• AMR Narrow Band – 20 ms frames, 1 to 33 frames per packet
AMR-NB data is compliant with RFC 3267, RTP Payload for AMR.
Note: Voice activity detection (VAD) is disabled by firmware when frames per packet
is greater than 10. This cannot be changed by the application.
Note: Using the AMR-NB resource in connection with one or more Dialogic
®
products mentioned herein does not grant the right to practice the AMR-NB
standard. To seek a patent license agreement to practice the standard,
contact the VoiceAge Corporation at http://www.voiceage.com/licensing.php.
• G.722 Wideband – 64 kbps, 10 or 20 ms frames, 1 frame per packet
• G.722.2 AMR Wideband – 64 kbps, 10 or 20 ms frames, 1 frame per packet
Video Codecs for RTP
Supported video codecs for RTP include:
MPEG-4 video codec
MPEG-4 is supported with these characteristics:
Simple Profile (SP), Levels L0, L1
• Video picture formats – Sub-QCIF, QCIF
• Frame rate – Up to 15 fps
• Bit Rate – Up to 64 kbps
Simple Profile (SP), Level L2
• Video picture formats – Sub-QCIF, QCIF
• Frame rate – Sub-QCIF and QCIF up to 30 fps; CIF up to 15 fps
• Bit Rate – Up to 128 kbps
Simple Profile (SP), Level L3
• Video picture formats – Sub-QCIF, QCIF, CIF
• Frame rate – Up to 30 fps