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
Voice Channels
Type Codec Packaging Complexity (see Table 2)
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
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Benefits
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
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
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
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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
Supported Standards, MIBs, and RFCs
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.
–
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
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
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Configuration Tasks
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.
Command Purpose
Step 1
Step 2
Step 3
Step 4
Step 5
router# show voice dsp
router# configure terminal
router(config)# voice-card 0
router(config-voicecard)# codec
complexity
router(config-voicecard)# exit
{high | medium}
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.
Enter global configuration mode.
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.
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.
Exit from voice-card configuration mode.
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
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
.
.
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codec complexity high is displayed. The
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
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.
Command Purpose
Step 1
Step 2
Step 3
Router# configure terminal
Router(config)# dial-peer voice tag {voip | vofr |
voatm}
Router(config-dial-peer)# codec codec [bytes
payload-size
]
Enter global configuration mode.
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.
Specify a codec for the dial peer. Codec types are as
follows:
The default is g729r8.
Configuration Tasks
g711alaw, g711ulaw,
g723ar53, g723ar63, g723r53, g723r63,
g726r16, g726r24, g726r32,
g728,
g729abr8, g729ar8, g729br8, g729r8
Step 4
Router(config-dial-peer)# exit
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',
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 ?.
Exit from dial-peer configuration mode.
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Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
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,
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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*
Command Reference
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codec (dial-peer)
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
no codec
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
codec [bytes payload-size]
Syntax Description
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.
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
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codec (dial-peer)
Command History
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.
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.
Table 3 Voice Payload-per-Frame Options and Defaults
Codec Protocol Voice Payload Options (bytes)
g711alaw
g711ulaw
g723ar53
g723r53
g723ar63
g723r63
g726r16
g726r24
Vo I P
Vo F R
Vo AT M
Vo I P
Vo F R
Vo AT M
Vo I P
Vo F R
Vo AT M
Vo I P
Vo F R
Vo AT M
Vo I P
Vo F R
Vo AT M
80, 160
40 to 240 in multiples of 40
40 to 240 in multiples of 40
20 to 220 in multiples of 20
20 to 240 in multiples of 20
20 to 240 in multiples of 20
24 to 216 in multiples of 24
24 to 240 in multiples of 24
24 to 240 in multiples of 24
20 to 220 in multiples of 20
10 to 240 in multiples of 10
10 to 240 in multiples of 10
30 to 210 in multiples of 30
15 to 240 in multiples of 15
30 to 240 in multiples of 15
Default Voice
Payload (bytes)
160
240
240
20
20
20
24
24
24
40
60
60
60
90
90
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Table 3 Voice Payload-per-Frame Options and Defaults
Codec Protocol Voice Payload Options (bytes)
Default Voice
Payload (bytes)
g726r32
g728 Vo I P
g729abr8
g729ar8
g729br8
g729r8
Vo I P
Vo F R
Vo AT M
Vo F R
Vo AT M
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
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10
10 to 230 in multiples of 10
10 to 240 in multiples of 10
10 to 240 in multiples of 10
80
120
120
40
60
60
20
30
30
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
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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codec complexity
To match the DSP complexity packaging to the codec(s) to be supported, enter the codec complexity
voice-card configuration command. The no form of the command restores the default value.
codec complexity {high | medium}
no codec complexity
codec complexity
Syntax Description
Defaults The DSP supports medium complexity codecs.
Command Modes Voice-card configuration
Command History
high With high complexity packaging, each DSP supports two voice channels encoded in any
of the following formats: 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.729, G.729 Annex B, G.728, and fax relay.
medium With medium complexity packaging, each DSP supports four voice channels encoded in
any of the following formats: G.711ulaw, G.711alaw, G.726(r16), G.726(r24),
G.726(r32), G.729 Annex A, G.729 Annex B with Annex A, and fax relay. This is the
default.
Release Modification
12.0(5)XK The command was introduced 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 This command was first supported on the Cisco MC3810 series for use
with the high performance compression module (HCM).
12.1(2)T This command was implemented in the 12.1(2)T release.
Usage Guidelines Select a higher codec complexity if that is required in order to support a particular codec or combination
of codecs.
Select a lower codec complexity to support the greatest number of voice channels, provided that the
lower complexity is compatible with the particular codecs in use.
To change codec complexity, all of the DSP voice channels must be in the idle state.
Codec complexity refers to the amount of processing required to perform voice compression. Codec
complexity affects the call density—the number of calls that can take place on the digital signal
processors (DSPs). With higher codec complexity, fewer calls can be handled.
Note In the Cisco MC3810 series, this command is valid only with HCM(s) installed, and you
must specify voice card 0 in the command mode. If two HCMs are installed, the codec
complexity command configures both HCMs at once.
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codec complexity
Examples The following example sets the codec complexity to high on a Cisco MC3810 containing one or two
HCMs:
router(config)# voice-card 0
router(config-voicecard)# codec complexity high
The following example sets the codec complexity to high on voice card 1 in a Cisco 2600 or 3600 series
router:
router(config)# voice-card 1
router(config-voicecard)# codec complexity high
Related Commands
Command Description
show voice dsp Shows the current status of all DSP voice channels.
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ds0-group
To specify the DS0 timeslots that make up a logical voice port on a T1 or E1 controller, and to specify
the signaling type, enter the ds0-group controller configuration command. Use the no form of the
command to remove the DS0 group and signaling setting.
ds0-group ds0-group-number timeslots timeslot-list type signal-type
no ds0-group ds0-group-number
ds0-group
Syntax Description
ds0-group-number A number from 0 to 23 (for T1) or from 0 to 30 (for E1) to identify the DS0
group.
timeslot-list A single timeslot number, a range of numbers, or multiple ranges of numbers
separated by commas. Allowable values are 1 to 24 for T1 and 1 to 32 for E1.
Examples are:
• 2
• 1-15, 17-23
• 1-23
• 2, 4, 6-12, 27-32
type The signaling method selection for type depends on the connection that you are
making. The E&M interface allows connection for PBX trunk lines (tie lines) and
telephone equipment. The FXS interface allows connection of basic telephone
equipment and PBXs. The FXO interface is for connecting the central office
(CO) to a standard PBX interface where permitted by local regulations; it is often
used for off-premises extensions.
The following options are available on T1 and E1 controllers:
• e&m-immediate-start—no specific off-hook and on-hook signaling
• e&m-delay-dial—the originating endpoint sends an off-hook signal and
then waits for an off-hook signal followed by an on-hook signal from the
destination
• e&m-wink-start—the originating endpoint sends an off-hook signal and
waits for a wink signal from the destination
• fxs-ground-start—Foreign Exchange Station ground-start signaling
support
• fxs-loop-start —Foreign Exchange Station loop-start signaling support
• fxo-ground-start—Foreign Exchange Office ground-start signaling support
• fxo-loop-start—Foreign Exchange Office loop-start signaling support
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ds0-group
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The following options are available only on E1 controllers on the Cisco MC3810
series:
• e&m-melcas-immed—E&M Mercury Exchange Limited Channel
Associated Signaling (MELCAS) immediate start signaling support
• e&m-melcas-wink—E&M MELCAS wink start signaling support
• e&m-melcas-delay—E&M MELCAS delay start signaling support
• fxo-melcas—MELCAS Foreign Exchange Office signaling support
• fxs-melcas—MELCAS Foreign Exchange Station signaling support
The following options are available only when the mode ccs command is enabled
on the Cisco MC3810 series for transparent CCS support:
• ext-sig-master—For the specified channel(s), automatically generates the
off-hook signal and stays in the off-hook state
• ext-sig-slave—For the specified channel(s), automatically generates the
answer signal when a call is terminated to that channel
Defaults No DS0 group is defined.
Command Modes Controller configuration
Command History
Release Modification
11.2 This command was introduced on the Cisco AS5300 as cas-group.
12.0(1)T The cas-group command was first supported on the Cisco 3600 series.
12.0(5)T This command was renamed ds0-group on the Cisco AS5300 and on the Cisco 2600
and 3600 series (requires Digital T1 Packet Voice Trunk Network Modules).
12.0(7)XK Support for this command was extended to the Cisco MC3810 series. When the
ds0-group command became available on the Cisco MC3810 series, the
voice-group command was removed and no longer supported.
12.1(2)T This command was implemented in the 12.1(2)T release.
Usage Guidelines The ds0-group command automatically creates a logical voice port that is numbered as follows on the
Cisco MC3810 series: slot:ds0-group-number.
On the Cisco MC3810 series, the slot number is the controller number. Although only one voice port is
created for each DS0 group, applicable calls are routed to any channel in the group.
On the Cisco MC3810 series when configured for transparent CCS, the channel type configured as the
ext-sig-master is considered the master side of the permanent virtual circuit (PVC) connection which
is responsible for establishing the PVC connection. After the master channel is configured, a fixed timer
of 30 seconds starts. The voice-signaling driver then generates an off-hook signal on the master voice
channel after the timer expires. The call is treated as a regular call, and the master channel does not hang
up after the connection is made. If the call does not go through, or if the T1/E1 trunk is down, the
30-second timer on the master channel side restarts. A new off-hook signal is then generated at the
master channel side after the timer expires.
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ds0-group
Examples The following example configures DS0 groups 0 and 1 with different CAS signaling on controller T1 0:
router(config)# controller T1 0
router(config-controller)# mode cas
router(config-controller)# framing esf
router(config-controller)# linecode b8zs
router(config-controller)# ds0-group 0 timeslot 1-10 type fxs-ground-start
router(config-controller)# ds0-group 1 timeslot 11-24 type fxo-loop-start
The following example configures DS0 groups 1 and 2 on controller T1 0 to support transparent CCS:
router(config)# controller T1 0
router(config-controller)# mode ccs cross-connect
router(config-controller)# ds0-group 1 timeslot 1-10 type ext-sig-master
router(config-controller)# ds0-group 2 timeslot 11-24 type ext-sig-slave
Related Commands
Command Description
codec complexity Matches the DSP complexity packaging to the codec(s) to be supported.
Voice channels in DS0 groups must be in the idle state before codec
complexity can be changed.
mode ccs Configures the T1/E1 controller to support CCS cross-connect or CCS
frame-forwarding.
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voice-card
voice-card
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
To configure a voice card and enter voice-card configuration mode, enter the voice-card command.
voice-card slot
Syntax Description
slot On the Cisco 2600 and 3600 platforms:
• A value from 0 to 3 that identifies the physical slot in the chassis where the voice
card is located.
On Cisco MC3810 concentrators with one or two HCMs installed:
• Enter 0 only; this applies to the entire chassis.
Command Modes Global configuration
Command History
Release Modification
12.0(5)XK The command was introduced 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 This command was first supported on the Cisco MC3810 series.
12.1(2)T This command was implemented in the 12.1(2)T release.
Usage Guidelines You can configure codec complexity only in voice-card configuration mode. On the Cisco 2600 and
3600 series, the slot corresponds to the physical slot in the chassis. On the Cisco MC3810 series, the
slot is always 0, and all changes made in voice-card mode apply to the entire Cisco MC3810. On
Cisco MC3810 series concentrators, this command is available only if the chassis is equipped with one
or two HCMs.
Examples The following example enters voice-card configuration mode for the voice card in slot 1 on a
Cisco 2600 or 3600 router:
router(config)# voice-card 1
router(config-voicecard)#
The following example enters voice-card configuration mode on a Cisco MC3810 concentrator:
router(config)# voice-card 0
router(config-voicecard)#
Related Commands
Command Description
codec complexity Matches the DSP complexity packaging to the codec(s) to be supported.
Cisco IOS Release 12.1(2)T
16
Codec complexity changes are made in the voice-card configuration mode.
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