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

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

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Contents

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.

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. PLAR endpoints are statically configured and do not require the user dialing to connect calls. The connection plar creates a VoIP call without digit dialing.

Installation

Image:scheme.jpg

Configuration

Connect devices as show in figure.

Numbering scheme of analog ports (necessary to create plar connection).

Innovaphone IP22 number called number when off-hook
TEL1 103 203
TEL2 102 202


Cisco 1700 number called number during incoming PBX ring
FXO voice-port 2/0 202 102
FXO voice-port 2/1 203 103


Cisco Configuration

IP and network configurations are omitted.

FXO 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
timeouts call-disconnect 1
timeouts wait-release 1
timing guard-out 300
connection plar opx 102   <--- incoming calls from PBX generate calls to phone number 102; Cisco SIP dial-peer number 2 is matched
!
voice-port 2/1
input gain -6
output attenuation 6
no non-linear
no vad
playout-delay nominal 100
playout-delay mode fixed
timeouts call-disconnect 1
timeouts wait-release 1
timing guard-out 300
connection plar opx 103   <--- incoming calls from PBX generate calls to phone number 103; Cisco SIP dial-peer number 2 is matched


Dial Peer, command line configuration:

dial-peer voice 2 voip                  <--- when dial-peer is matched a SIP INVITE is sent to Innovaphone Media Gateway
description SIP_CALL_TO_IP22                 
destination-pattern 1..
modem passthrough nse codec g711alaw
session protocol sipv2
session target ipv4: __IP22__IP_ADDRESS__
session transport udp
incoming called-number .
dtmf-relay rtp-nte
codec g711alaw
fax rate disable
fax protocol pass-through g711alaw
no vad
!
dial-peer voice 3 pots                  <--- POTS dial-peer is used in outgoing calls from IP22 to PBX
description FROM_IP22_TEL3
destination-pattern 203
port 2/1
!
dial-peer voice 4 pots
description FROM_IP22_TEL2
destination-pattern 202
port 2/0

The outgoing SIP INVITE to IP22 has this format: 102@IP22_IP_ADDRESS or 103@IP22_IP_ADDRESS .

SIP UA configuration:

sip-ua 
disable-early-media 180
max-forwards 10
retry invite 3
timers expires 60000
no suspend-resume

IP22 Configuration

IP and network configurations are omitted.

A Gateway without Registration must be configured as show in figure:

Image:ip22_gw.jpg

Routes configuration:

Image:ip22_route.jpg

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