# FreeSWITCH SIP Trunk Creation

## Introduction

This document provides instructions on how to add a SIP Trunk to FreeSWITCH Server to work with the ProSBC. Please visit the following link for more details about [Creating a SIP Trunk in FreeSWITCH Server](https://freeswitch.org/confluence/display/FREESWITCH/Configuring+FreeSWITCH)

## FreeSWITCH SIP Trunk Configuration

To configure FreeSWITCH server to work with ProSBC SIP trunk the following changes are required:

1\. We will use prsbc.telcobridges.com FQDN as a ProSBC server. You can set anything you want. Or you can use ProSBC IP address. Add /etc/freeswitch/sip\_profiles/external/prosbc.xml file:

```
<include>
    <gateway name="prosbc">
        <!-- To send calls to prosbc: -->
        <param name="proxy" value="prosbc.telcobridges.com"/> 
        <!-- Registration is not required for FreeSWITCH on Static IP address -->
        <param name="register" value="false" />
        <param name="username" value=""/>
        <param name="password" value=""/>
    </gateway>
</include>
```

2\. To send outbound calls to ProSBC SIP Trunk create /etc/freeswitch/dialplan/default/prosbc.xml file:

```
<include>
    <extension name="prosbc_outbound">
        <!-- The following line detects outbound calls with a 9 as a dropped prefix -->
        <!-- The line after sends the 8-15 digit numbers to the ProSBC gateway -->
        <condition field="destination_number" expression="^9(\d{8,15})$">
            
        </condition>
    </extension>
</include>
```

3\. To accept incoming calls from Telephone Numbers assigned to your SIP Trunk account create /etc/freeswitch/dialplan/public/prosbc\_inbound\_did.xml file:

```
<include>
    <extension name="prosbc_did">
        <!-- This example maps the DID 14506558993 to ring 1000 in the default context -->
        <condition field="destination_number" expression="^(14506558993)$">
            
            
        </condition>
    </extension>
</include>
```

Note: example above is provided for illustration purposes only. Your actual dialplan will depend on specific FreeSWITCH configuration.


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