Datasheet

Configuring Voice Ports
Configuring Digital Voice Ports
VC-62
Cisco IOS Voice, Video, and Fax Configuration Guide
The basic steps for configuring digital voice ports are described in the next three sections. They are
grouped by the configuration mode from which they are executed, as follows:
• Configuring Codec Complexity for Digital T1/E1 Voice Ports, page 62
Codec complexity refers to the amount of processing power assigned to codec processing on a voice
port. On most router platforms that support codec complexity, codec complexity is selected in voice
card configuration mode, although it is selected in DSP interface mode on the Cisco 7200 and
7500 series. The value configured for codec complexity establishes the choice of codecs that are
available on the dial peers. See the Configuring Dial Plans, Dial Peers, and Digit Manipulation
chapter in this configuration guide for more information about configuring dial peers.
• Configuring Controller Settings for Digital T1/E1 Voice Ports, page 65
Specific line characteristics must be configured to match those of the PSTN line that is being
connected to the voice port. These are typically configured in controller configuration mode.
• Configuring Basic Voice Port Parameters for Digital T1/E1 Voice Ports, page 76
Voice port configuration mode allows many of the basic voice call attributes to be configured to
match those of the PSTN or PBX connection being made on this voice port.
In addition to the basic voice port parameters, there are additional commands that allow for the fine-
tuning of the voice port configurations or for configuration of optional features. In most cases, the default
values for these commands are sufficient for establishing voice port configurations. If it is necessary to
change some of these parameters to improve voice quality or to match parameters in proprietary PBXs
to which you are connecting, use the commands in the “Fine-Tuning Analog and Digital Voice Ports”
section on page 78.
After voice port configuration, make sure the ports are operational by following the steps described in
these sections:
• Verifying Analog and Digital Voice-Port Configurations, page 97
• Troubleshooting Analog and Digital Voice Port Configurations, page 108
For more information on voice port commands, refer to the Cisco IOS Voice, Video, and Fax Command
Reference.
Configuring Codec Complexity for Digital T1/E1 Voice Ports
On the Cisco 2600, 3600, 7200, and 7500 routers, codec complexity can be configured separately for
each T1/E1 digital packet voice trunk network module or port adapter. On a Cisco MC3810 multiservice
concentrator, only a single codec complexity setting is used, even when two HCMs are installed. The
value specified in this task affects the choice of codecs available when the codec dial-peer configuration
command is configured.
For details on the number of calls that can be handled simultaneously using each of the codec standards,
refer to the entries for codec and codec complexity in the Cisco IOS Voice, Video, and Fax Command
Reference and to platform-specific product literature.
For more information on codec complexity, see the “Configuring Codec Complexity for Analog Voice
Ports on the Cisco MC3810 with High-Performance Compression Modules” section on page 45.
Two configuration task tables are shown below: one for the Cisco 2600 and 3600 series routers and the
Cisco MC3810 concentrator, which use voice card configuration mode, and the second for the
Cisco 7200 and 7500 series routers, which use DSP interface configuration mode.