Table Of Contents
G.722-64 and iLBC Codec Support on Cisco Unified Border Elements, DSP Farms, and Voice Gateways
Contents
How to Configure G.722-64 and iLBC Codecs for Voice Gateways
Conferencing and Transcoding Session Capacities
How to Configure G.722-64 and iLBC Codecs for Cisco Unified Border Elements
Additional References
Related Documents
Standards
MIBs
RFCs
Technical Assistance
Command Reference
codec (dial-peer)
codec (DSP Farm profile)
codec preference
Feature Information for G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways
G.722-64 and iLBC Codec Support on Cisco Unified Border Elements, DSP Farms, and Voice Gateways
First Published: December 17, 2007
Last Updated: December 27, 2007
The G.722-64 and iLBC codecs are supported for Cisco Unified Border Elements (Cisco UBEs), DSP farms, and voice gateways. Conferencing and universal transcoding are supported on both codecs.
Finding Feature Information in This Module
Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways" section.
Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
•
How to Configure G.722-64 and iLBC Codecs for Voice Gateways
•How to Configure G.722-64 and iLBC Codecs for Cisco Unified Border Elements
•Additional References
•Command Reference
•Feature Information for G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways
How to Configure G.722-64 and iLBC Codecs for Voice Gateways
The G.722-64 and iLBC codecs can be used to enable conferencing and transcoding on Cisco IOS voice gateways in a Cisco Unified Communications Manager network. Digital signal processor (DSP) farms provide conferencing and transcoding services using DSP resources on high-density digital voice/fax network modules.
To configure conferencing and transcoding for voice gateway routers, see the "Configuring Enhanced Conferencing and Transcoding for Voice Gateway Routers" chapter of the Cisco CallManager and Cisco IOS Interoperability Guide.
For more information on configuring iLBC codecs for H.323 and SIP, see the "Dial Peer Overview" chapter and "Dial Peer Features and Configuration" chapter in Dial Peer Configuration on Voice Gateway Routers
The following changes apply to this chapter:
Codecs
End-user devices must be equipped with one of the following codecs:
|
Codec
|
Packetization Periods for Transcoding (ms)
|
G.711 a-law, G.711 u-law, G.722-64 |
10, 20, or 30 |
G.729, G.729A, G.729B, G.729AB |
10, 20, 30, 40, 50, or 60 |
iLBC |
20 or 30 |
Conferencing and Transcoding Session Capacities
Each DSP is individually configurable to support either conferencing or transcoding and standard voice termination. The total number of conferencing, transcoding, and voice termination sessions is limited by the capacity of the entire system, which includes the DSPs, hardware platform, physical voice interface, and Cisco Unified Communications Manager.
Table 1 and Table 2 list the maximum number of conference calls and transcoding sessions that DSPs can handle, in theory. Actual capacity may be less based on the total system design.
Table 1 DSP Theoretical Session Capacities
|
Application
|
NM-HD-1V/2V
(1 DSP)
|
NM-HD-2VE
(3 DSPs)
|
NM-HDV2
(16 DSPs)
|
2801/2811
(2 PVDM2-64)
|
2821/2851
(3 PVDM2-64)
|
3825, 3845
(4 PVDM2-64)
|
|
Conferencing
|
G.711 |
8 sessions
(64 conferees) |
24 sessions
(192 conferees) |
50 sessions
(400 conferees) |
50 sessions
(400 conferees) |
50 sessions
(400 conferees) |
50 sessions
(400 conferees) |
G.722-64 |
2 sessions
(16 conferees) |
6 sessions
(48 conferees) |
32 sessions
(256 conferees) |
16 sessions
(128 conferees) |
24 sessions
(192 conferees) |
32 sessions
(256 conferees) |
G.729 |
2 sessions
(16 conferees) |
6 sessions
(48 conferees) |
32 sessions
(256 conferees) |
16 sessions
(128 conferees) |
24 sessions
(192 conferees) |
32 sessions
(256 conferees) |
iLBC |
1 session
(8 conferees) |
3 sessions
(24 conferees) |
16 sessions
(128 conferees) |
8 sessions
(64 conferees) |
12 sessions
(96 conferees) |
16 sessions
(128 conferees) |
|
Transcoding
|
G.711 a-law/u-law <-> G.729a/G.729ab/ GSM FR |
8 sessions |
24 sessions |
128 sessions |
64 sessions |
96 sessions |
128 sessions |
G.711 a-law/u-law <-> G.729/G.729b/ GSM EFR |
6 sessions |
18 sessions |
96 sessions |
48 sessions |
72 sessions |
96 sessions |
G.722-64 <-> G.711 |
8 sessions |
24 sessions |
128 sessions |
64 sessions |
96 sessions |
128 sessions |
G.722-64<-> any |
4 sessions |
12 sessions |
64 sessions |
32 sessions |
48 sessopms |
64 sessions |
iLBC <-> G.711 |
6 sessions |
18 sessions |
96 sessions |
48 sessions |
72 sessions |
96 sessions |
iLBC <-> any |
3 sessions |
9 sessions |
48 sessions |
24 sessions |
36 sessions |
48 sessions |
|
Voice Termination
|
G.711 a-law/u-law |
16 sessions |
48 sessions |
256 sessions |
128 sessions |
192 sessions |
256 sessions |
G.722-64, G.726, G.729a, G.729ab, iLBC |
8 sessions |
24 sessions |
128 sessions |
64 sessions |
96 sessions |
128 sessions |
G.729, G.729b, G.723.1, G.728 |
6 sessions |
18 sessions |
96 sessions |
48 sessions |
72 sessions |
96 sessions |
Table 2 Theoretical System Capacities for One DSP
|
Application
|
G.711 a-law/u-law
|
G.722-64
|
G729 a/ab
|
G.729, G.729b
|
iLBC
|
|
Conferencing
|
8 sessions
(8 x 8 = 64 conferees) |
2 sessions
(8 x 2 = 16 conferees) |
2 sessions
(8 x 2 = 16 conferees) |
2 sessions
(8 x 2 = 16 conferees) |
1 session
(1 x 8 = 8 conferees) |
|
Conferencing on PVDM2-8
|
4 sessions
(4 x 8 = 32 conferees) |
1 session
(1 x 8 = 8 conferees) |
1 session
(1 x 8 = 8 conferees) |
1 session
(1 x 8 = 8 conferees) |
1 session
(1 x 8 = 8 conferees) |
|
Hardware MTP
|
16 sessions |
— |
— |
— |
— |
|
Transcoding
|
8 sessions |
8 sessions |
8 sessions |
6 sessions |
8 sessions |
How to Configure G.722-64 and iLBC Codecs for Cisco Unified Border Elements
The G.722-64 and iLBC codecs can be used to set up transcoding on Cisco Unified Border Elements (Cisco UBEs). To configure these codecs on a Cisco UBE, see the "Fundamental Cisco Multiservice IP-to-IP Gateway Configuration" chapter of the Cisco Multiservice IP-to-IP Gateway document.
Additional References
The following sections provide references related to G.722-64 and iLBC Codec Support on Cisco UBEs, DSP farms, and voice gateways.
Related Documents
Standards
|
Standard
|
Title
|
H245, Annex S |
Control protocol for multimedia communication |
MIBs
|
MIB
|
MIBs Link
|
•CISCO-VOICE-COMMON-DIAL-CONTROL-MIB.my •CISCO-VOICE-DIAL-CONTROL-MIB.my |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: http://www.cisco.com/go/mibs |
RFCs
|
RFC
|
Title
|
RFC3951 |
Internet Low Bit Rate Codec (iLBC) |
RFC3952 |
Real-time Transport Protocol (RTP) Payload Format for internet Low Bit Rate Codec (iLBC) Speech |
Technical Assistance
|
Description
|
Link
|
The Cisco Technical Support & Documentation website contains thousands of pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content. |
http://www.cisco.com/techsupport |
Command Reference
This section documents new and modified commands:
•codec (dial-peer)
•codec (DSP Farm profile)
•codec preference
codec (dial-peer)
To specify the voice coder rate of speech for a dial peer, use the codec command in dial-peer configuration mode. To reset the default value, use the no form of this command.
Cisco 1750 and Cisco 1751 Modular Access Routers, Cisco AS5300 and AS5800 Universal Access Servers, and Cisco MC3810 Multiservice Concentrators
codec codec [bytes payload_size]
no codec codec [bytes payload_size]
Cisco 2600 and 3600 Series Routers and Cisco 7200 and 7500 Series Routers
codec {codec [bytes payload_size] | transparent}
no codec {codec [bytes payload_size] | transparent}
Syntax Description
codec |
Codec options available for the various platforms are described in Table 3, below. |
bytes |
(Optional) Specifies the number of bytes in the voice payload of each frame. |
payload-size |
(Optional) Number of bytes in the voice payload of each frame. See Table 4 for valid entries and default values. |
transparent |
Enables codec capabilities to be passed transparently between endpoints in a Cisco Unified Border Element. Note The transparent keyword is only available on the Cisco 2600 and 3600 Series Router and Cisco 7200 and 7500 Series Router platforms. |
Table 3 Codec support by platform
|
Codec
|
Cisco 1750 and Cisco 1751 Modular Access Routers
|
Cisco 2600 and 3600 Series Routers and Cisco 7200 and 7500 Series Routers
|
Cisco AS5300 and AS5800 Universal Access Servers
|
Cisco MC3810 Multiservice Concentrators
|
clear-channel—Clear channel at 64,000 bits per second (bps) |
Yes |
Yes |
— |
Yes |
g711alaw—G.711 A-Law at 64,000 bps |
Yes |
Yes |
Yes |
Yes |
g711ulaw—G.711 u-Law at 64,000 bps |
Yes |
Yes |
Yes |
Yes |
g722-64—G.722-64 at 64,000 bps |
Yes |
Yes |
Yes |
— |
g723ar53—G.723.1 Annex A at 5300 bps |
— |
Yes |
Yes |
Yes |
g723ar63—G.723.1 Annex A at 6300 bps |
— |
Yes |
Yes |
Yes |
g723r53—G.723.1 at 5300 bps |
— |
Yes |
Yes |
Yes |
g723r63—G.723.1 at 6300 bps |
— |
Yes |
Yes |
Yes |
g726r16—G.726 at 16,000 bps |
Yes |
Yes |
Yes |
Yes |
g726r24—G.726 at 24,000 bps |
Yes |
Yes |
Yes |
Yes |
g726r32—G.726 at 32,000 bps |
Yes |
Yes |
Yes |
Yes |
g726r53—G.726 at 53,000 bps |
Yes |
Yes |
Yes |
— |
g726r63—G.726 at 63,000 bps |
Yes |
Yes |
Yes |
— |
g728—G.728 at 16,000 bps |
— |
Yes |
Yes |
Yes |
g729abr8—G.729 Annex A and B at 8000 bps |
Yes |
Yes |
Yes |
Yes |
g729ar8—G729 Annex A at 8000 bps |
Yes |
Yes |
Yes |
Yes |
g729br8—G.729 Annex B at 8000 bps |
Yes |
Yes |
Yes |
Yes |
g729r8—G.729 at 8000 bps. This is the default codec |
Yes |
Yes |
Yes |
Yes |
Defaults
g729r8, 30-byte payload for VoFR and VoATM
g729r8, 20-byte payload for VoIP
See Table 4 for valid entries and default values.
Command Modes
dial-peer configuration
Command History
|
Release
|
Modification
|
11.3(1)T |
This command was introduced on the Cisco 3600 series. |
11.3(3)T |
This command was implemented on the Cisco 2600 series. |
12.0(3)T |
This command was implemented on the Cisco AS5300. This release does not support the clear-channel keyword. |
12.0(4)T |
This command was implemented on the Cisco 3600 series, Cisco 7200 series and the Cisco MC3810. This release modified the command for VoFR dial peers. |
12.0(5)XE |
Additional codec choices and other options were implemented. |
12.0(5)XK |
The g729br8 and pre-ietf codec choices were added for the Cisco 2600 and Cisco 3600 series. |
12.0(7)T |
This command was integrated into Cisco IOS Release 12.0.(7)T and implemented on the Cisco AS5800. Additional voice coder rates of speech were added. This release does not support the clear-channel keyword on this platform. |
12.0(7)XK |
The g729abr8 and g729ar8 codec choices were for the Cisco MC3810, and the keyword pre-ietf was deleted. |
12.1(1)T |
This command was integrated in Cisco IOS Release 12.1(1)T. |
12.1(5)T |
The gsmefr and gsmfr codec keywords were added. |
12.2(8)T |
The command was implemented on Cisco 1750 and Cisco 1751. |
12.2(13)T3 |
The transparent keyword was added. This keyword is available only in js2 images. |
12.4(4)T |
The gsmefr and gsmfr codec keywords were removed. |
12.4(15)XY |
The g722-64 keyword was added. |
Usage Guidelines
Use this command to define a specific voice coder rate of speech and payload size for a VoIP or VoFR dial peer. This command is also used for VoATM.
A specific codec type can be configured on the dial peer as long as it is supported by the setting used with the codec complexity voice-card configuration command. The codec complexity command is voice-card specific and platform specific. The codec complexity voice-card configuration command is set to either high or medium.
If the codec complexity command is set to high, the following keywords are available: g711alaw, g711ulaw, g722-64, g723ar53, g723ar63, g723r53, g723r63, g726r16, g726r24, g726r32, g728, g729r8, and g729br8.
If the codec complexity command is set to medium, the following keywords are available: g711alaw, g711ulaw, g726r16, g726r24, g726r32, g729r8, and g729br8.
The codec dial-peer configuration command is particularly useful when you must change to a small-bandwidth codec. Large-bandwidth codecs, such as G.711, do not fit in a small-bandwidth link. However, the g711alaw and g711ulaw codecs provide higher quality voice transmission than other codecs. The g729r8 codec provides near-toll quality with considerable bandwidth savings.
If codec values for the dial peers of a connection do not match, the call fails.
You can change the payload of each VoIP frame by using the bytes keyword; you can change the payload of each VoFR frame by using the bytes keyword with the payload-size argument. However, increasing the payload size can add processing delay for each voice packet.
Table 4 describes the voice payload options and default values for the codecs and packet voice protocols.
Table 4 Voice Payload-per-Frame Options and Defaults
|
Codec
|
Protocol
|
Voice Payload Options (in Bytes)
|
Default Voice Payload (in Bytes)
|
g711alaw
g711ulaw |
VoIP
VoFR
VoATM |
80, 160
40 to 240 in multiples of 40
40 to 240 in multiples of 40 |
160
240
240 |
g722-64 |
VoIP |
80, 160. 240 |
160 |
g723ar53
g723r53 |
VoIP
VoFR
VoATM |
20 to 220 in multiples of 20
20 to 240 in multiples of 20
20 to 240 in multiples of 20 |
20
20
20 |
g723ar63
g723r63 |
VoIP
VoFR
VoATM |
24 to 216 in multiples of 24
24 to 240 in multiples of 24
24 to 240 in multiples of 24 |
24
24
24 |
g726r16 |
VoIP
VoFR
VoATM |
20 to 220 in multiples of 20
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
40
60
60 |
g726r24 |
VoIP
VoFR
VoATM |
30 to 210 in multiples of 30
15 to 240 in multiples of 15
30 to 240 in multiples of 15 |
60
90
90 |
g726r32 |
VoIP
VoFR
VoATM |
40 to 200 in multiples of 40
20 to 240 in multiples of 20
40 to 240 in multiples of 20 |
80
120
120 |
g728 |
VoIP
VoFR
VoATM |
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
40
60
60 |
g729abr8
g729ar8
g729br8
g729r8 |
VoIP
VoFR
VoATM |
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
20
30
30 |
For toll quality, use the g711alaw or g711ulaw keyword. These values provide high-quality voice transmission but use a significant amount of bandwidth. For nearly toll quality (and a significant savings in bandwidth), use the g729r8 keyword.
Note The clear-channel keyword is not supported on Cisco AS5300.
Note The G.723 and G.728 codecs are not supported on the 1700 platform for Cisco Hoot and Holler applications.
Note The transparent keyword affects only H.323 to H.323 connections.
Note The G.722-64 codec is only supported for H.323 and SIP.
Examples
The following example shows how to configure a voice coder rate that provides toll quality voice with a payload of 120 bytes per voice frame on a router that is acting as a terminating node. The sample configuration begins in global configuration mode and is for VoFR dial peer 200.
The following example configures a voice coder rate for VoIP dial peer 10 that provides toll quality but uses a relatively high amount of bandwidth:
The following example configures the transparent codec used by the Cisco Unified Border Element:
incoming called-number .T
Related Commands
|
Command
|
Description
|
codec (DSP interface dsp farm) |
Specifies call density and codec complexity. |
codec (voice port) |
Specifies voice compression. |
codec complexity |
Specifies call density and codec complexity based on the codec used. |
show dial peer voice |
Displays the codec setting for dial peers. |
codec (DSP Farm profile)
To specify the codecs supported by a digital signal processor (DSP) farm profile, use the codec command in DSP farm profile configuration mode. To remove the codec, use the no form of this command.
codec {codec-type | pass-through}
no codec {codec-type | pass-through}
Syntax Description
codec-type |
Specifies the codec preferred. •g711alaw—G.711 a-law 64,000 bps. •g711ulaw—G.711 u-law 64,000 bps. •g722r-64—G.722-64 at 64,000 bps •g729abr8—G.729 ANNEX A and B 8000 bps. •g729br8—G.729 ANNEX B 8,000 bps. •g729ar8—G.729 ANNEX A and R 8000 bps. •g729r8—G.729 8000 bps. |
pass-through |
Enables codec pass-through. Supported for transcoding and MTP profiles. |
Command Default
Transcoding
•g711alaw
•g711ulaw
•g729abr8
•g729ar8
Conferencing
•g711alaw
•g711ulaw
•g729abr8
•g729ar8
•g729br8
•g729r8
MTP
•g711ulaw
Command Modes
DSP farm profile configuration
Command History
|
Release
|
Modification
|
12.3(8)T |
This command was introduced. |
12.4(4)T |
The pass-through keyword was added. |
12.4(15)XY |
The g722-64 keyword was added. |
Usage Guidelines
Only one codec is supported for each Media Termination Point (MTP) profile. To support multiple codecs, you must define a separate MTP profile for each codec.
Hardware MTPs support only G.711 a-law and G.711 u-law. If you configure a profile as a hardware MTP, and you want to change the codec to other than G.711, you must first remove the hardware MTP by using the no maximum sessions hardware command.
The pass-through keyword is supported for transcoding and MTP profiles only; it is not supported for conferencing profiles. To support the RSVP agent on a SCCP device, you must use the codec pass-through command. In pass-through mode, the SCCP device processes the media stream using a pure software MTP regardless of the nature of the stream. This enables video and data streams to be processed in addition to audio. When pass-through mode is set in a transcoding profile, no transcoding is done for the session; the transcoding device performs a pure software MTP function. Pass-through mode can be used for Secure RTP sessions.
Examples
The following example shows the call density and codec complexity being set to GSMEFR:
Router(config)# dspfarm profile 123 transcode
Router(config-dspfarm-profile)# codec gsmefr
Related Commands
|
Command
|
Description
|
associate application |
Associates the SCCP protocol to the DSP farm profile. |
dspfarm profile |
Enters DSP farm profile configuration mode and defines a profile for DSP farm services. |
maximum sessions (DSP Farm profile) |
Specifies the maximum number of sessions that are supported by the profile. |
rsvp |
Enables RSVP support on a transcoding or MTP device. |
shutdown (DSP Farm profile) |
Disables a DSP farm profile. |
codec preference
To specify a list of preferred codecs to use on a dial peer, use the codec preference command in voice-class configuration mode. To disable this functionality, use the no form of this command.
codec preference value codec-type [mode frame_size][bytes payload-size] [packetization-period 20] [encap rfc3267] [frame-format {bandwidth-efficient | octet-aligned [crc | no-crc]}] [modes modes-value]
no codec preference value codec-type
Syntax Description
value |
The order of preference, with 1 being the most preferred and 14 being the least preferred. |
codec-type |
The codec preferred. Values are as follows: •clear-channel—Clear Channel 64,000 bps •g711alaw—G.711 a law 64,000 bps •g711ulaw—G.711 mu-law 64,000 bps •g722r-64—G.722-64 at 64,000 bps •g723ar53—G.723.1 ANNEX-A 5300 bps •g723ar63—G.723.1 ANNEX-A 6300 bps •g723r53—G.723.1 5300 bps •g723r63—G.723.1 6300 bps •g726r16—G.726 16,000 bps •g726r24—G.726 24,000 bps •g726r32—G.726 32,000 bps •g728—G.728 16,000 bps •g729abr8—G.729 ANNEX-A and B 8000 bps •g729br8—G.729 ANNEX-B 8000 bps •g729r8—G.729 8000 bps •gsmamr-nb—Enables GSMAMR codec capability •ilbc—internet Low Bitrate Codec (iLBC) at 13,330 bps or 15,200 bps. •transparent—Enables codec capabilities to be passed transparently between endpoints Note The transparent keyword not supported when the call-start command is configured. |
mode |
(Optional) For iLBC codecs only. Specifies the iLBC operating frame mode that is encapsulated in each packet. |
frame_size |
(Optional) For iLBC codecs only. iLBC operating frame in milliseconds (ms). Valid entries are: •20—20ms frames for 15.2kbps bit rate •30—30ms frames for 13.33 kbps bit rate Default is 20. |
bytes |
(Optional) Specifies that the size of the voice frame is in bytes. |
payload-size |
(Optional) Number of bytes you specify as the voice payload of each frame. Values depend on the codec type and the packet voice protocol. |
packetization-period 20 |
(Optional) Sets the packetization period at 20 ms. Applicable only to GSMAMR-NB codec support. |
encap rfc3267 |
(Optional) Sets the encapsulation value to comply with RFC 3267. Applicable only to GSMAMR-NB codec support. |
frame-format |
(Optional) Specifies a frame format. Supported values are octet-aligned and bandwidth-efficient. The default is octet-aligned. Applicable only to GSMAMR-NB codec support. |
crc | no-crc |
(Optional) CRC is applicable only for octet-aligned frame format. If you enter bandwidth-efficient frame format, the crc | no-crc options will not be available because they are inapplicable. Applicable only to GSMAMR-NB codec support. |
modes modes-values |
(Optional) Valid values are from 0 to 7. You can specify modes as a range (for example, 0-2), or individual modes separated by commas (for example, 2,4,6), or a combination of the two (for example, 0-2,4,6-7). Applicable only to GSMAMR-NB codec support. |
Command Default
If the gsmamr-nb keyword is entered, the default values are as follows:
Packetization period is 20 ms.
Encap is rfc3267.
Frame format is octet-aligned.
CRC is no-crc.
Modes value is 0-7.
Command Modes
Voice-class configuration
Command History
|
Release
|
Modification
|
12.0(2)XH |
This command was introduced on the Cisco AS5300. |
12.0(7)T |
This command was implemented on the Cisco 2600 series and Cisco 3600 series. |
12.0(7)XK |
This command was implemented on the Cisco MC3810. |
12.1(2)T |
This command was integrated into Cisco Release IOS Release 12.1(2)T. |
12.1(5)T |
The codecs gsmefr and gsmfr were added. |
12.2(13)T3 |
The transparent keyword was added. |
12.4(4)T |
The codecs gsmefr and gsmfr were removed. |
12.4(4)XC |
This command was extended to include GSMAMR-NB codec parameters on the Cisco AS5350XM and Cisco AS5400XM platforms. |
12.4(9)T |
This command was integrated into Cisco IOS Release 12.4(9)T. |
12.4(11)T |
The ilbc codec and mode keyword were added. |
12.4(15)XY |
The g722r-64 keyword was added. |
Usage Guidelines
The routers at opposite ends of the WAN may have to negotiate the codec selection for the network dial peers. The codec preference command specifies the order of preference for selecting a negotiated codec for the connection. Table 5 describes the voice payload options and default values for the codecs and packet voice protocols.
Note The transparent keyword not supported when the call start command is configured.
Table 5 Voice Payload-per-Frame Options and Defaults
|
Codec
|
Protocol
|
Voice Payload Options (in Bytes)
|
Default Voice Payload (in Bytes)
|
|
g711alaw
g711ulaw
|
VoIP
VoFR
VoATM |
80, 160
40 to 240 in multiples of 40
40 to 240 in multiples of 40 |
160
240
240 |
|
g722r-64
|
VoIP |
80, 160, 240 |
160 |
|
g723ar53
g723r53
|
VoIP
VoFR
VoATM |
20 to 220 in multiples of 20
20 to 240 in multiples of 20
20 to 240 in multiples of 20 |
20
20
20 |
|
g723ar63
g723r63
|
VoIP
VoFR
VoATM |
24 to 216 in multiples of 24
24 to 240 in multiples of 24
24 to 240 in multiples of 24 |
24
24
24 |
|
g726r16
|
VoIP
VoFR
VoATM |
20 to 220 in multiples of 20
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
40
60
60 |
|
g726r24
|
VoIP
VoFR
VoATM |
30 to 210 in multiples of 30
15 to 240 in multiples of 15
30 to 240 in multiples of 15 |
60
90
90 |
|
g726r32
|
VoIP
VoFR
VoATM |
40 to 200 in multiples of 40
20 to 240 in multiples of 20
40 to 240 in multiples of 20 |
80
120
120 |
|
g728
|
VoIP
VoFR
VoATM |
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
40
60
60 |
|
g729abr8
g729ar8
g729br8
g729r8
|
VoIP
VoFR
VoATM |
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10 |
20
30
30 |
ilbc |
VoIP |
For mode 20, 38, 76, 114, 152, 190, 228. For mode 30, 50, 100, 150, 200 |
38 50 |
Examples
The following example sets the codec preference to the GSMAMR-NB codec and specifies parameters:
Router(config-voice-class)# codec preference 1 gsmamr-nb packetization-period 20 encap
rfc3267 frame-format octet-aligned crc
The following example creates codec preference list 99 and applies it to dial peer 1919:
codec preference 1 g711alaw
codec preference 2 g711ulaw bytes 80
codec preference 3 g723ar53
codec preference 4 g723ar63 bytes 144
codec preference 5 g723r53
codec preference 6 g723r63 bytes 120
codec preference 7 g726r16
codec preference 8 g726r24
codec preference 9 g726r32 bytes 80
codec preference 10 g729br8
codec preference 11 g729r8 bytes 50
codec preference 12 gsmefr
dial-peer voice 1919 voip
The following example configures the transparent codec used by the Cisco Unified Border Element:
codec preference 1 transparent
codec preference 1 transparent
Note You can only assign a preference value of 1 to the transparent codec. Additional codecs assigned to other preference values are ignored if the transparent codec is used.
The following example shows how to configure the iLBC codec used by the Cisco Unified Border Element:
codec preference 1 ilbc 30 200
Related Commands
|
Command
|
Description
|
call-start |
Forces an H.323 Version 2 gateway to use fast connect or slow connect procedures for a dial peer. |
voice class codec |
Enters voice-class configuration mode and assigns an identification tag number to a codec voice class. |
voice-class codec (dial peer) |
Assigns a previously configured codec selection preference list to a dial peer. |
Feature Information for G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways
Table 6 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Cisco IOS software images are specific to a Cisco IOS software release, a feature set, and a platform. Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Note Table 6 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
Table 6 Feature Information for G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways
|
Feature Name
|
Releases
|
Feature Information
|
iLBC Codec Support |
12.4(11)T |
The internet Low Bitrate Codec (iLBC) is a standard, high-complexity speech codec that is suitable for robust voice communication over IP. iLBC has built-in error correction functionality that helps the codec perform in networks with a high-packet loss. |
G.722-64 and iLBC Codec Support on Cisco UBEs, DSP Farms, and Voice Gateways |
12.4(15)XY |
The G.722-64 and iLBC codecs are supported for Cisco UBEs, DSP farms, and voice gateways. Conferencing and universal transcoding are supported on both codecs. |
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
© 2007 Cisco Systems, Inc. All rights reserved.
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