For any business migrating to SIP, the Patton SN4554 is a brilliant way to bring two ISDN lines (4-channels) in to their new PBX system, especially considering you don’t have to break open your PBX Server to install a PCI card.

This basic How-To shows you how to set it up to work with your Elastix system:

First off, you’ll want the following config which is a bit of a mash-up from some other documentation on making it work with an Aastra 800 (Include the header):

#----------------------------------------------------------------#
#                                                                #
# Template for SN4554/2BIS/UI to use with Elastix                #
# Use with firmware R5.1 or higher                               #
#                                                                #
# This template uses dhcp to retrieve an IP address. Comments in #
# the file indicate what to change (Start with '#')              #
#                                                                #
# See the SmartWare Software Configuration guide for command     #
# details (http://www.patton.com/manuals/SCG-r52.pdf)            #
# Modified by Josiah Spackman                                    #
# http://chillingsilence.wordpress.com                           #
#----------------------------------------------------------------#

cli version 3.20
webserver port 80 language en

system

  ic voice 0
    low-bitrate-codec g711alaw64k

system
  clock-source 1 bri 0 0
  clock-source 2 bri 0 1

profile ppp default

profile tone-set default

profile voip default
  codec 1 g711alaw64k rx-length 20 tx-length 20
  codec 2 g711ulaw64k rx-length 20 tx-length 20
  fax transmission 1 relay t38-udp

profile pstn default

profile sip default

profile aaa default
  method 1 local
  method 2 none

context ip router

  interface IF_IP_WAN
# replace 'dhcp' with your fix IP if needed, e.g. "ipaddress 172.16.1.20 255.255.0.0"
    ipaddress dhcp
    tcp adjust-mss rx mtu
    tcp adjust-mss tx mtu

context ip router
# uncomment the following line if you need to add routing table entries
  # route 0.0.0.0 0.0.0.0 172.16.1.1

context cs switch
  national-prefix 0
  international-prefix 00

  routing-table called-e164 RT_ISDN_TO_SIP
# 'T' in the following lines specifies "digit collection". The time for collection can be adjusted replacing 'T' wih 'T2' for 2 seconds.
    route T dest-interface IF_SIP

  routing-table calling-e164 RT_SIP_TO_ISDN
    route default dest-service SV_HUNT_PSTN MP_Unknown-Subscriber

# This mapping table sets the ISDN type of number for calls towards ISDN to 'subscriber'
  mapping-table calling-e164 to calling-type-of-number MP_Unknown-Subscriber
    map default to subscriber

  interface isdn IF_ISDN_0
    route call dest-table RT_ISDN_TO_SIP

  interface isdn IF_ISDN_1
    route call dest-table RT_ISDN_TO_SIP

  interface sip IF_SIP
    bind context sip-gateway GW_SIP
    route call dest-table RT_SIP_TO_ISDN
# This is the IP of your Asterisk. Replace with domain name if DNS server is available
    remote 192.168.0.250

  service hunt-group SV_HUNT_PSTN
    drop-cause normal-unspecified
    drop-cause no-circuit-channel-available
    drop-cause network-out-of-order
    drop-cause temporary-failure
    drop-cause switching-equipment-congestion
    drop-cause access-info-discarded
    drop-cause circuit-channel-not-available
    drop-cause resources-unavailable
    route call 1 dest-interface IF_ISDN_0
    route call 2 dest-interface IF_ISDN_1

context cs switch
  no shutdown

# The parameters realm, username and password have to match your Asterisk configuration
authentication-service AUTH_AASTRA800
  realm 1 smartnode-gw
  username patton password 6953789

# The parameters domain, username, identity (=username) below have to match your Aastra800 configuration
location-service LS_AASTRA800
  domain 1 smartnode-gw

  identity-group default

    authentication inbound
      authenticate 1 authentication-service AUTH_AASTRA800 patton 6953789

  identity 6953789

    authentication inbound
      authenticate 1 authentication-service AUTH_AASTRA800 patton 6953789

    registration inbound

context sip-gateway GW_SIP

  interface WAN
    bind interface IF_IP_WAN context router port 5060

context sip-gateway GW_SIP
  bind location-service LS_AASTRA800
  no shutdown

port ethernet 0 0
  medium auto
  encapsulation ip
  bind interface IF_IP_WAN router
  no shutdown

port bri 0 0
  clock auto
  encapsulation q921

  q921
    protocol pp
    uni-side auto
    encapsulation q931

    q931
      protocol dss1
      uni-side user
      bchan-number-order ascending
      encapsulation cc-isdn
      bind interface IF_ISDN_0 switch

port bri 0 0
  no shutdown

port bri 0 1
  clock auto
  encapsulation q921

  q921
    protocol pp
    uni-side auto
    encapsulation q931

    q931
      protocol dss1
      uni-side user
      bchan-number-order ascending
      encapsulation cc-isdn
      bind interface IF_ISDN_1 switch

port bri 0 1
  no shutdown

Copy this all into a notepad window and save it as “SN4554.cfg”

What you’re going to want to modify is the references to “192.168.0.250″ and point it to your Elastix / Asterisk system.

All the ISDN ports are set to “Point-to-Point”. You can adjust the “pp” settings to “pmp” if you require “Point-to-Multipoint”, though to be honest ISDN isn’t my strong point so I’m not entirely sure how relevant that is.

This will leave the WAN port using DHCP, hopefully you’ve got a semi-intelligent DHCP server that will give out the same IP each time.

Open the WebGUI of your SN4554 up, login with the default Username “administrator” and a blank password.

Click on “Import / Export” on the left-hand side, then hit the Import Configuration tab.

Select the file, import it, then reload the device.

Now, in asterisk you want to add a new SIP trunk. Name it “ISDN” and put the following in the SIP PEER Details:

username=patton
type=friend
secret=6953789
qualify=1200
insecure=very
host=192.168.0.141
dtmfmode=RFC2833
disallow=all
context=from-pstn
canreinvite=no
allow=alaw&g729

There’s no register string or USER details, though it may be worth specifying the max channels as “4″.

You’ll need to adjust the “host” setting to the WAN IP Address of your Patton box, as we’re semi-insecure with such a basic password.

You *could* adjust the password and username in the config etc as applicable, but specifying the host should be enough, especially considering (in my instance) the whole system is LAN-accessible only.

When you’re finished, you should be able to login to your Elastix system via SSH and run:

asterisk -rx ’sip show peers’

And see:

ISDN/patton                192.168.0.141        N      5060     OK (19 ms)

If you do, congratulations, you’re ready to go!

Now you just need to setup inbound and outbound routes as applicable.

If this was useful to you, please leave a comment and say hi.

I’d also like to thank Byron from SnapperNet in New Zealand, he’s been such a great help, and also provided me with the initial configuration samples.

This How-To has also been re-posted here: http://chillingsilence.wordpress.com/2010/05/06/using-the-patton-sn4554-for-isdn-with-elastix/