Specifications

Configuration Tasks
14
Cisco IOS Release 12.0(3)T
For more information about Frame Relay, refer to the Cisco IOS Release 12.0 Wide-Area
Networking Configuration Guide.
Configure Voice Ports
When an interface on the Cisco AS5300 is carrying voice data, it is referred to as a voice port. Voice
over IP on the Cisco AS5300 is supported over three different interface types in this release:
• ISDN PRI
• E1R2 Signalling
• T1-CAS Signalling
Note A voice port was created automatically when you installed the VFC in the Cisco AS5300 and
configured an ISDN PRI group. Configuring an ISDN PRI group is part of the basic Cisco AS5300
configuration procedure. For more information, refer to the Cisco AS5300 Universal Access Server
Software Configuration Guide.
Configure ISDN PRI Voice Ports
With ISDN PRI, signalling in Voice over IP for the AS5300 is handled by ISDN PRI group
configuration. After ISDN PRI has been configured for both B and D channels for both ISDN PRI
lines, you need to issue the isdn incoming-voice command on the serial interface (acting as the D
channel) to ensure a dial tone.
Under most circumstances, the default voice-port command values are adequate to configure voice
ports to transport voice data over your existing IP network. Because of the inherent complexities
involved with PBX networks, you might need specific voice-port values configured, depending on
the specifications of the devices in your telephony network. For more information regarding specific
voice-port configuration commands, refer to the “Command Reference” section of this document.
Configure ISDN PRI for Voice over IP
To configure a voice port, use the following commands beginning in global configuration mode:
Step Command Purpose
1 isdn switch-type switch-type Defines the telephone company’s switch type.
2 controller T1 0 Enables the T1 0 controller and enters controller
configuration mode.
3 framing esf Defines the framing characteristics.
4 clock source line primary Configures one T1 line to serve as the primary
clock source.
5 linecode value Sets the line code type to match that of your
telephone company service provider.
6 pri-group timeslots range Configures ISDN PRI.
7 controller T1 1 Enables the T1 1 controller and enters controller
configuration mode.
8 framing esf Defines the framing characteristics.
9 linecode value Sets the line code type to match that of your
telephone company service provider.