Configuring Voice Ports

This chapter explains how to configure voice ports using the CLIs created and modified for the Cisco VG350, Cisco VG310, and Cisco VG320 Analog Voice Gateways and associated service modules.

This chapter contains the following topics:

Prerequisites

Before you configure voice ports on Cisco VG350, Cisco VG310, or Cisco VG320, you must establish a working IP network.

Configuring the Voice Port

This section discuss the changes and modifications on the following CLIs. For configuration examples, see the “Cisco VG350, Cisco VG310, and Cisco VG320 Configuration Examples” section

loop-length

The loop-length CLI is created to configure the analog FXS voice port. It has the following format:

voice-port x/y/z

[ no ] loop-length [ long | short ]

The loop-length CLI has the following characteristics:

  • For Cisco VG350 platform, the default is short loop-length. This CLI is not applicable to analog FXS on motherboard slot.
  • This CLI is only applicable to all 48 FXS voice ports on SM-D-48FXS-E and the first 4 (0-3) FXS voice ports on SM-D-72FX like the Cisco VG350 platform.
  • For Cisco VG310 and VG320 platforms, the default FXS is short loop-length and long loop-length FXS needs to be configured.
  • On Cisco VG310, only the first eight voice ports 0/0/0-7 can be configured as long loop (OPX-lite). On Cisco VG320, the first four voice ports 0/0/0 - 0/0/3 can be configured as long loop (OPX-lite).
  • On Cisco VG320, FXS voice ports on VIC 1 (0/1/0 - 0/1/23) will not support long loop. By default, they are short-loop FXS.
  • Shutdown and no shutdown are required on the voice port after loop-length is configured for it to take effect.
  • Because up to 2 ren is supported on long-loop (OPX-lite) FXS, when loop-length long is configured on the FXS voice port, if its existing ren configuration is greater than 2, it will be changed automatically to 2, a message “The existing ren configuration is changed to 2" is displayed on the console.
  • When loop-length short is configured on the FXS voice port, if the voice port has ring dc-offset configured, the ring dc-offset configuration will be removed. A message “The existing ring dc-offset configuration is removed” is displayed on the console.

ren

The existing ren CLI under FXS voice port will accept value 1-2 for FXS voice port with loop-length long configured. For short loop-length analog FXS voice port, ren CLI will accept value 1-5.

ring dc-offset

The existing ring dc-offset CLI is configurable on the long loop-length FXS voice port.

cm-current-enhance

The existing cm-current-enhance CLI is configurable on the long loop-length FXS voice port.

vmwi

The existing vmwi [fsk | dc-voltage] is configurable on all on-board FXS voice ports.

Where to Go Next

For further information on VoIP configuration procedures and debug commands, refer to the following: Cisco IOS Voice Configuration Library