Howto:FXS FXO trunk with IP22 media gateway and Cisco 1700 router

This article describes how to realize an analog trunk using Innovaphone FXS media gateway and Cisco router.

Applies To

This information applies to

• IP 22, V7

Build 09-70300.14 and later.

• Cisco 1700 router

IOS C1700-IPVOICEK9-M, Version 12.4(19b)

More Information

Problem Details

In this case Innovaphone IP22 is used as FXS media gateway with a Cisco 1700 Router to realize an analog PBX extension over an IP network. The VoIP signaling protocol used is SIP.

Installation

Configuration

Connect devices as show in figure.

Cisco FXO gateway must forward incoming calls to IP22. This automatic mechanism is realized with PLAR OPX feature. The private line automatic ringdown Off-Premises extension allows remote FXS devices to appear to a central PBX as a directly connected extension.When the FXO port detects a ring from PBX, the Cisco router sends a VoIP call setup to IP22 but it does not take the FXO port off-hook. As a result, the PBX only sees the call answer signal when IP22 FXS port is picked up. In the same way, IP22 must forward outgoing calls to FXO gateway.

CISCO CONFIGURATION: (network configurations is omitted)

Voice port command line configuration:

voice-port 2/0
input gain -6
output attenuation 6
no non-linear
no vad
playout-delay nominal 100
playout-delay mode fixed
cptone IT
timeouts interdigit 5
timeouts call-disconnect 1
timeouts wait-release 1
timing guard-out 300
connection plar opx 102

!

voice-port 2/1
input gain -6
output attenuation 6
no non-linear
no vad
playout-delay nominal 100
playout-delay mode fixed
cptone IT
timeouts interdigit 5
timeouts call-disconnect 1
timeouts wait-release 1
timing guard-out 300
connection plar opx 103