> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/telecom-concepts/adding-enum-query-for-lnp-to-routing-script.md).

# Adding ENUM Query for LNP to Routing Script

> **Applies to:** 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)


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