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Cisco IOS Release 12.1(2)T

Configuring Cisco MC3810 Series Concentrators

to Use High-Performance Compression Modules

This document describes feature changes introduced in Cisco IOS Release 12.0(7)XK and supported in

Cisco IOS Release 12.1(2)T and later for Cisco MC3810 series concentrators that contain

high-performance voice compression modules (HCMs).

This document includes the following sections:

•“Feature Overview” on page 1

•“Supported Platforms” on page 2

•“Supported Standards, MIBs, and RFCs” on page 3

•“Prerequisites” on page 3

•“Configuration Tasks” on page 3

•“Command Reference” on page 7

Feature Overview

High-performance voice compression modules (HCMs) provide voice compression according to the

voice compression coding algorithm (codec) specified when the Cisco MC3810 is configured. Table 1

shows the number of voice channels each type of compression module can support.

Table 1 Voice Compression Module Application Information

Type Codec Packaging Complexity (see Table 2)

Voice Channels

per HCM

HCM2 High complexity (codec complexity set to high)4

Medium complexity (codec complexity set to medium)8

HCM6 High complexity (codec complexity set to high)12

Medium complexity (codec complexity set to medium)24

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Supported Platforms

Cisco IOS Release 12.1(2)T

Benefits

HCMs support more voice channels than the earlier voice compression modules (VCMs) used in the

Cisco MC3810 series.

Restrictions

The following restrictions apply to HCMs:

•HCMs should not be combined with VCMs in a Cisco MC3810 chassis.

•HCMs require Cisco IOS Release 12.0(7)XK or 12.1(2)T or later.

Related Features and Technologies

Voice over Internet Protocol (VoIP)

Voice over Frame Relay (VoFR)

Voice over Asynchronous Transfer Mode (VoATM)

Related Documents

•Cisco IOS Multiservice Applications Configuration Guide, Cisco IOS Release 12.1

•Cisco IOS Multiservice Applications Command Reference, Cisco IOS Release 12.1

Supported Platforms

•Cisco MC3810 series

Table 2 Codec Packaging Information

Codec Packaging Codecs

High complexity G.711ulaw, G.711alaw

G.723.1(r5.3), G.723.1 Annex A(r5.3), G.723.1(r6.3), G.723.1 Annex A(r6.3)

G.726(r16), G.726(r24), G.726(r32)

G.728

G.729, G.729 Annex B

fax relay

Medium complexity G.711ulaw, G.711alaw

G.726(r16), G.726(r24), G.726(r32)

G.729 Annex A, G.729 Annex B with Annex A

fax relay

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Supported Standards, MIBs, and RFCs

Cisco IOS Release 12.1(2)T

Supported Standards, MIBs, and RFCs

RFCs

•RFC 1890— RTP: A Transport Protocol for Real-Time Applications

•RFC 1889—RTP Profile for Audio and Video Conferences with Minimal Control

MIBs

•CISCO-ENTITY-VENDORTYPE-OID-MIB

•OLD-CISCO-CHASSIS-MIB

•CAS_INTF_MIB

International Telecommunication Union (ITU-T) G-Series Codec Compression Specifications

–

G.711 A Law at 64,000 bps

–

G.711 u Law at 64,000 bps

–

G.723.1 Annex A at 5300 bps

–

G.723.1 Annex A at 6300 bps

–

G.723.1 at 5300 bps

–

G.723.1 at 6300 bps

–

G.726 at 16,000 bps

–

G.726 at 24,000 bps

–

G.726 at 32,000 bps

–

G.728 at 16,000 bps

–

G.729 at 8000 bps

–

G.729 Annex A and B at 8000 bps

–

G.729 Annex A at 8000 bps

–

G.729 Annex B at 8000 bps

Prerequisites

One or two HCM modules must be installed in your Cisco MC3810 chassis.

Note An HCM may not be combined with a VCM in one chassis.

Configuration Tasks

Complete the following tasks to configure the Cisco MC3810 voice ports for operation with one or two

HCMs installed:

•Configuring Codec Complexity

•Specifying Codecs for Network Dial Peers

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Configuration Tasks

Cisco IOS Release 12.1(2)T

Configuring Codec Complexity

To configure codec complexity for voice ports, enter the following commands, beginning in privileged

EXEC mode. Commands apply to both analog and digital voice ports unless otherwise indicated. You

enter the codec complexity command in voice-card configuration mode. On the Cisco MC3810 series,

voice-card 0 is used as a virtual voice-card, and the setting applies to all voice ports on a Cisco MC3810.

This procedure does not cover other voice-port configuration commands that may be required. To learn

more, see the Cisco IOS Multiservice Applications Configuration Guide and the Cisco IOS Multiservice

Applications Command Reference for Cisco IOS Release 12.1.

Verifying Codec Complexity Settings

To verify the codec complexity configuration, enter the show running-config command to display the

current voice-card setting. If medium complexity is specified, the codec complexity setting is not

displayed. If high complexity is specified, the setting codec complexity high is displayed. The

following example shows an excerpt from the command output if high complexity has been specified:

Router# show running-config

hostname router-alpha

voice-card 0

codec complexity high

Command Purpose

Step 1 router# show voice dsp Check the DSP voice channel activity. If any DSP voice channels are in the

busy state, you cannot change the codec complexity.

When all of the DSP channels are in the idle state, continue to step 2.

Step 2 router# configure terminal Enter global configuration mode.

Step 3 router(config)# voice-card 0 Enter voice-card configuration mode and specify voice card 0. Voice card 0

provides the configuration mode for setting the codec complexity on a

Cisco MC3810.

Step 4 router(config-voicecard)# codec

complexity {high | medium}Specify the codec complexity for this Cisco MC3810 according to the

bandwidth requirements and the number of voice channels to be supported

per DSP. The default is medium complexity, which provides four voice

channels per DSP.

See the “codec complexity” section on page 11 in the Command Reference

for information about the codec complexity command.

Step 5 router(config-voicecard)# exit Exit from voice-card configuration mode.

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Configuration Tasks

Cisco IOS Release 12.1(2)T

Specifying Codecs for Network Dial Peers

Follow these steps to specify a codec for each network dial peer according to the codec complexity

setting selected for this Cisco MC3810. If you do not set codec complexity and specify a codec, the

defaults remain in effect: medium complexity and G.729, 8000 bps.

This does not cover the complete dial-peer configuration procedure. To learn more, see the Cisco IOS

Multiservice Applications Configuration Guide and the Cisco IOS Multiservice Applications Command

Reference for Cisco IOS Release 12.1.

Verifying Network Dial Peers

Follow the procedure below to verify dial-peer configuration. To learn more about these commands, see

the Cisco IOS Multiservice Applications Configuration Guide and the Cisco IOS Multiservice

Applications Command Reference for Cisco IOS Release 12.1.

Enter the privileged EXEC show dial-peer voice command. The following text is sample output from

the show dial-peer voice command for a VoIP dial peer:

Router# show dial-peer voice 10

VoiceOverIpPeer10

information type = voice,

tag = 10, destination-pattern = `555....',

answer-address = `', preference=0,

group = 10, Admin state is up, Operation state is up,

incoming called-number = `', connections/maximum = 0/unlimited,

DTMF Relay = disabled,

application associated:

type = voip, session-target = `ipv4:10.1.1.1',

Command Purpose

Step 1 Router# configure terminal Enter global configuration mode.

Step 2 Router(config)# dial-peer voice tag {voip |vofr |

voatm}Enter dial-peer configuration mode and specify a

network dial peer for which to specify a codec.

tag is one or more digits to identify the dial peer. Valid

entries are 1 to 2147483647.

Step 3 Router(config-dial-peer)# codec codec [bytes

payload-size]Specify a codec for the dial peer. Codec types are as

follows:

g711alaw, g711ulaw,

g723ar53, g723ar63, g723r53, g723r63,

g726r16, g726r24, g726r32,

g728,

g729abr8, g729ar8, g729br8, g729r8

The default is g729r8.

Optionally specify the voice payload (in bytes) of each

frame.

For information about the options available for the

codec command, see the command reference section or

enter ?.

Step 4 Router(config-dial-peer)# exit Exit from dial-peer configuration mode.

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Configuration Tasks

Cisco IOS Release 12.1(2)T

technology prefix:

ip precedence = 0, UDP checksum = disabled,

session-protocol = cisco, req-qos = best-effort,

acc-qos = best-effort,

fax-rate = voice, payload size = 20 bytes

codec = g711alaw, payload size = 160 bytes,

Expect factor = 10, Icpif = 30,signaling-type = cas,

VAD = enabled, Poor QOV Trap = disabled,

voice class perm tag = `'

Connect Time = 0, Charged Units = 0,

Successful Calls = 0, Failed Calls = 0,

Accepted Calls = 0, Refused Calls = 0,

Last Disconnect Cause is "",

Last Disconnect Text is "",

Last Setup Time = 0.

The following text is sample output from the show dial-peer voice command for a VoFR dial peer:

Router# show dial-peer voice 20

VoiceOverFRPeer20

information type = voice,

tag = 20, destination-pattern = `555....',

answer-address = `', preference=0,

group = 20, Admin state is up, Operation state is up,

incoming called-number = `', connections/maximum = 0/unlimited,

DTMF Relay = disabled,

application associated:

type = vofr, session-target = `Serial0 120',

called number = `',

session-protocol = cisco-switched,

fax-rate = voice, payload size = 30 bytes

codec = g729r8, payload size = 30 bytes,

signaling-type = cas,

VAD = enabled,

Voice Sequence Numbers = disabled,

voice class perm tag = `'

Connect Time = 0, Charged Units = 0,

Successful Calls = 0, Failed Calls = 0,

Accepted Calls = 0, Refused Calls = 0,

Last Disconnect Cause is "",

Last Disconnect Text is "",

Last Setup Time = 0.

The following text is sample output from the show dial-peer voice command for a VoATM dial peer:

Router# show dial-peer voice 1

VoiceOverATMPeer1

information type = voice,

tag = 1, destination-pattern = `555....',

answer-address = `', preference=5,

group = 1, Admin state is up, Operation state is up,

incoming called-number = `', connections/maximum = 0/unlimited,

DTMF Relay = disabled,

application associated:

type = voatm, session-target = `ATM0 pvc 101/1001',

session-protocol = cisco-switched,

fax-rate = voice, payload size = 30 bytes

codec = g729r8, payload size = 30 bytes,

signaling-type = cas,

VAD = enabled,

Voice Sequence Numbers = disabled,

voice class perm tag = `'

Connect Time = 0, Charged Units = 0,

Successful Calls = 0, Failed Calls = 0,

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

Command Reference

Cisco IOS Release 12.1(2)T

Accepted Calls = 0, Refused Calls = 0,

Last Disconnect Cause is "",

Last Disconnect Text is "",

Last Setup Time = 0.

Command Reference

This section documents new or modified commands. Modified commands are indicated by an

asterisk (*). All other commands used with this feature are documented in the Cisco IOS Release 12.1

command reference publications.

•codec (dial-peer)*

•codec complexity*

•ds0-group*

•voice-card*

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

codec (dial-peer)

Cisco IOS Release 12.1(2)T

codec (dial-peer)

To specify the voice codec for a network dial peer, enter the codec dial-peer configuration command.

Use the no form of this command to restore the default value.

codec codec [bytes payload-size]

no codec

Syntax Description

Defaults If no codec is specified, dial peers are configured for g729r8 and the voice payload is as shown in Table 3

for G.729r8.

If a codec is specified without the bytes keyword, the voice payload is as shown in Table 3.

Command Modes Dial-peer configuration

codec Codec options on Cisco MC3810 series equipped with HCM, and with codec

complexity set to high or medium:

•g711alaw—G.711 A Law, 64000 bps

•g711ulaw—G.711 u Law, 64000 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, 16000 bps

•g726r24—G.726, 24000 bps

•g726r32—G.726, 32000 bps

•g728—G.728, 16000 bps

•g729abr8—G.729 Annex A and Annex B, 8000 bps

•g729ar8—G.729 Annex A, 8000 bps

•g729br8—G.729 Annex B, 8000 bps

•g729r8—G.729, 8000 bps

bytes (Optional) The voice payload for each frame.

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. See Table 3 for

valid entries and default values.

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

codec (dial-peer)

Cisco IOS Release 12.1(2)T

Command History

Usage Guidelines A codec type can be configured on the dial-peer if it is supported under the codec complexity setting

you have specified.

The 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, g711alaw and g711ulaw provide higher-quality voice transmission than other codecs. For

almost toll quality (and a significant savings in bandwidth), g729r8 provides near-toll quality with

considerable bandwidth savings.

If the destination router does not support a codec required by the originating router, the call setup fails.

You can change the payload of each voice packet frame by using the bytes payload-size setting. However,

increasing the payload size can add processing delay for each voice packet. Table 3 describes the voice

payload options and default values for the codecs and packet voice protocols.

Release Modification

11.3(1)T This command was introduced as a Cisco 3600 series VoIP dial-peer

configuration command.

12.0(4)T This command was modified for VoFR dial peers. On the

Cisco MC3810 series, this command was first supported as a dial-peer

command.

12.0(5)XK The g729br8 codec and pre-ietf keyword were added for the

Cisco 2600 and 3600 series.

12.0(7)T This command was implemented in the 12.0(7)T release.

12.0(7)XK The g729abr8 and g729ar8 codecs were added for the Cisco MC3810

series and the keyword pre-ietf was deleted.

12.1(2)T This command was implemented in the 12.1(2)T release.

Table 3 Voice Payload-per-Frame Options and Defaults

Codec Protocol Voice Payload Options (bytes)

Default Voice

Payload (bytes)

g711alaw

g711ulaw

Vo I P

Vo F R

Vo AT M

80, 160

40 to 240 in multiples of 40

160

240

g723ar53

g723r53

Vo I P

Vo F R

Vo AT M

20 to 220 in multiples of 20

20 to 240 in multiples of 20

g723ar63

g723r63

Vo I P

Vo F R

Vo AT M

24 to 216 in multiples of 24

24 to 240 in multiples of 24

g726r16 Vo I P

Vo F R

Vo AT M

20 to 220 in multiples of 20

10 to 240 in multiples of 10

g726r24 Vo I P

Vo F R

Vo AT M

30 to 210 in multiples of 30

15 to 240 in multiples of 15

30 to 240 in multiples of 15

Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules

codec (dial-peer)

Cisco IOS Release 12.1(2)T

Examples The following example configures VoIP dial peer number 10 to use codec type g723r53 (G.723.1 at

5300 bps), and specifies a non-default voice payload size of 40 bytes:

router(config)# dial-peer voice 10 voip

router(config-dialpeer)# codec g723r53 bytes 40

Related Commands

g726r32 Vo I P

Vo F R

Vo AT M

40 to 200 in multiples of 40

20 to 240 in multiples of 20

40 to 240 in multiples of 20

120

g728 Vo I P

Vo F R

Vo AT M

10 to 230 in multiples of 10

10 to 240 in multiples of 10

g729abr8

g729ar8

g729br8

g729r8

Vo I P

Vo F R

Vo AT M

10 to 230 in multiples of 10

10 to 240 in multiples of 10

Table 3 Voice Payload-per-Frame Options and Defaults

Codec Protocol Voice Payload Options (bytes)

Default Voice

Payload (bytes)

Command Description

codec complexity This voice-card configuration command sets codec complexity and

call density.

show dial-peer voice Displays the codec setting for dial peers.

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