Adding ENUM Query for LNP to Routing Script

This article applies to:	Product	Version
	SBC	3.0, 3.1

This article describes how to integrate a routing script filter that sends ENUM queries for Local Number Portability, and enables ENUM name resolution support on ProSBC.

ProSBC Configuration

This section provides ProSBC configuration for the solution.

Install dnsruby gem

1. Automatic Installation

gem install dnsruby -v1.54

tbtoolpack stop

tbtoolpack start

2. Manual Installation

Download the gem from https://rubygems.org/downloads/dnsruby-1.54.gem 
Upload to SBC with sFTP
gem install --force --local dnsruby -v1.54
tbtoolpack stop
tbtoolpack start

Configure Routing Script

1. Enable routing script

Gateway->Use script

2. Load routing scripts

Gateway->Routes->Routing Script->Import Script File
File->naptr_called_replacement.rb
ScriptType->Filter
Load on startup->checked

3. Adding ENUM script to main script

Gateway->Routes->Routing Script->simple_routing_sbc.rb [Edit]

Three things need to be added.
At the start of the script:

require 'called_pre_remap' 

In the main class:

include EnumLNP

before_filter :method => :naptr_called_replacement

Click here to download naptr_called_replacement.rb Routing Script

Modifying ENUM Script

1. To set ENUM server IP in the script modify the following script parameter in the naptr_called_replacement.rb:

res = Dnsruby::Resolver.new (:nameserver => ['IPaddress'])  IP address must be ENUM Server IP address

2. To set the Domain Name for ENUM queries, change the following parameter in the naptr_called_replacement.rb:

 $domain = "IPAddress/FQDN" 

  Query examples;
  8.6.8.0.4.7.2.0.3.5.0.9.e164.arpa, e164.arpa is the domain
  8.6.8.0.4.7.2.0.3.5.0.9.e164.arpa.net, e164.arpa.net is the domain
  8.6.8.0.4.7.2.0.3.5.0.9.telcobridges.com, telcobridges.com is the domain
  8.6.8.0.4.7.2.0.3.5.0.9.187.202.34.12, 187.202.34.12 is the domain

3. In the answer check the Service and update the script. Service can be returned in the following and other formats;

 Service: E2U+SIP, Service: E2U+sip, Service: SIP+E2U, Service: sip+E2U and others

if a.service == "sip+E2U" || a.service == "SIP+E2U" ==> Change it here

4. In the answer, ENUM server can return "." or "@" or any other character in the regex after the number;

if it is "."
params[:call][:called] = tb_naptr_query("#{naptr_called}.#{$domain}", params)

if it is "@"
params[:call][:called] = tb_naptr_query("#{naptr_called}@#{$domain}", params)