Description Page 69 of 378
ITG Trunk 2.0 ISDN Signaling Link (ISL) Description, Installation and Operation
G.729
The G.729B codec use compression at 8 kbit/s (8:1 compression rate).
Optional AnnexB Voice Activity Detection/Silence Suppression is
configurable through MAT. Only 16 channels per card are supported with
G.729B due to higher DSP resources required for this codec.
G.723.1 (5.3 kbit/s or 6.3 kbit/s)
The G.723.1 codec provides the greatest compression. Voice Activity
Detection/Silence Suppression is configura ble through MAT. 24 c hannels per
card are supported with G.723.1.
Three downloadable DSP profiles support the codecs shown in Table4.
Each codec supports one of three sets of parameters: one for DSP, one for fax,
and one for codec.
Table 4
Codecs supported by the ITG
Profile1
32 ms. Echo Cancel Tail
24 ports/card
Profile2
32 ms. Echo Cancel Tail
24 ports/card
Profile3
32 ms. Echo Cancel Tail
16 ports/card
PCM A-law (G.711) PCM A-law (G.711) PCM A-law (G.711)
PCM µ-law (G.711) PCM µ-law (G.711) PCM µ-law (G.711)
G.729AB G.723.1 5.3 kbit/s G.729B
Clear Channel G.723.1 6.3 kbit/s Clear Channel
Fax Clear Channel Fax
Fax