Preferred Codec
Reference Manual (SIP Version)
Mediatrix 1204
201
G.729
Specified in ITU-T Recommendation G.729, coding of speech at 8 kbit/s using conjugate structure-algebraic
code excited linear prediction (CS-ACELP). For all data rates, the sampling frequency (and RTP timestamp
clock rate) is 8000 Hz.
A voice activity detector (VAD) and comfort noise generator (CNG) algorithm in Annex B of G.729 is
recommended for digital simultaneous voice and data applications; they can be used in conjunction with G.729
or G.729 Annex A. A G.729 or G.729 Annex A frame contains 10 octets, while the G.729 Annex B comfort
noise frame occupies 2 octets.
The Mediatrix 1204 supports G.729A and G.729AB for encoding and G.729, G.729A and G.729AB for
decoding.
Preferred Codec
The preferred codec is the codec you want to favour during negotiation.
X
To set a preferred codec:
1.
In the
voiceIfMIB,
locate the
voiceIfCodecPreferred
variable (
voiceIfCodecTable
).
This variable sets the preferred codec for this line.
2.
Choose the codec you want to use from one of the available configurations:
•
pcmu
•
pcma
•
g723
•
g729
•
g726-16kbps
•
g726-24kbps
•
g726-32kbps
•
g726-40kbps
The default value is
pcmu
.
Table 127:
G.729 Features
Feature
Description
Packetization time
Range of 10 ms to 100 ms with increment of 10 ms. See
for more details.
Voice Activity Detection (VAD)
The Mediatrix 1204 supports the annex B. Annex B is the built-in support
of VAD in G.729. See
for more details.
In the
Unit Manager Network Administration Manual
, refer to chapter
Ports Parameters
, section
Port
Configuration Window
.
Содержание Mediatrix 1204
Страница 6: ...Mediatrix Telecom a Division of Media5 Corporation Reference Manual...
Страница 26: ...Preface About this Manual End User Technical Support xxvi Mediatrix 1204...
Страница 27: ...Installation and Web Page Configuration...
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Страница 50: ...Chapter 1 Installation Verifying the Installation 24 Mediatrix 1204...
Страница 98: ...Chapter 4 Web Interface SIP Parameters SIP Authentication 72 Mediatrix 1204...
Страница 127: ...SNMP Configuration...
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Страница 162: ...Chapter 8 IP Address and Network Configuration Ethernet Connection Speed 136 Mediatrix 1204...
Страница 170: ...Chapter 9 SIP Servers Presence Compositor Server 144 Mediatrix 1204...
Страница 174: ...Chapter 10 DNS SRV Configuration DNS SRV Oriented Settings 148 Mediatrix 1204...
Страница 196: ...Chapter 12 Configuration File Download Configuration File Example 170 Mediatrix 1204...
Страница 220: ...Chapter 14 Gateway Configuration Detecting a Far End Disconnect 194 Mediatrix 1204...
Страница 240: ...Chapter 16 Voice Transmissions User Gain 214 Mediatrix 1204...
Страница 288: ...Chapter 23 Telephony Attributes Delayed Hot Line 262 Mediatrix 1204...
Страница 294: ...Chapter 25 Quality of Service QoS VLAN 268 Mediatrix 1204...
Страница 298: ...Chapter 26 Syslog Daemon Syslog Daemon Configuration 272 Mediatrix 1204...
Страница 302: ...Chapter 27 Statistics RTP Statistics 276 Mediatrix 1204...
Страница 319: ...Appendices...
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Страница 332: ...Appendix B Standard Hardware Information Warranty 306 Mediatrix 1204...
Страница 336: ...Appendix C Cabling Considerations RJ 11 Telephone Cable 310 Mediatrix 1204...
Страница 372: ...Appendix E Glossary Wide Area Network WAN 346 Mediatrix 1204...
Страница 390: ...Index W 364 Mediatrix 1204...