Gamma SIP Trunk Configuration Guide

How to configure Gamma SIP trunk with Yeastar S-Series VoIP PBX

Configure a SIP Trunk

1. Create an Account with Gamma
To start with, you need to have an account from Gamma. Please visit their website to get a SIP account: www.gamma.co.uk

2. Add a SIP Trunk in S-Series VoIP PBX
After you get the SIP trunk account, you need to add a SIP trunk in Yeastar S-Series VoIP PBX.
Go to Settings > PBX > Trunks, click Add.

Step1-Add-Trunk-Template-2020Jan

3. Configure the Gamma trunk
In the new window, select United Kingdom from the “Select Country” drop-down list and select Gamma from the “ITSP”.

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  • Name: give this SIP trunk a name to help you identify it.
  • Protocol: SIP.
  • Trunk Type: Peer Trunk.
  • Transport: UDP.
  • Username: your Gamma Account username.
  • Authentication Name: the same as the username.
  • From User: the same as the user name.
  • Caller ID Number: your Gamma Account DID number.

4. Check the Trunk Status
Click Save and Apply. Go to PBX Monitor to check if the SIP trunk is connected successfully as the screenshot below shows.

Gamma-Trunk-Status-S-Series-PBX

Configure the Outbound Route with Gamma Trunk

To make outbound calls via the newly created SIP trunk, you need to configure an outbound route for the trunk.
1. Create an Outbound Route
Go to Settings > PBX > Call Control > Outbound Routes, click Add.

Step4-Create-Outbound-routes-Template-2020Jan

2. Configure the Outbound Route
The system compares the number with the pattern that you have defined in your route 1. If it matches, it will initiate the call using the selected trunks. If it does not, it will compare the number with the pattern you have defined in route 2 and so on. The outbound route which is in a higher position will be matched firstly.
You can adjust the outbound route sequence by clicking these buttons

Add-Gamma-Outbound-Yeastar-S-Series-PBX
  • Route Name: give this outbound route a name to help you identify it.
  • Dial Patterns: set the dial patterns. As the settings below, to make calls via the SIP trunk, you need to precede the number to be dialed with the prefix 8.
  • Dial Pattern: 8.
  • Strip: 1
  • Member Extensions: select the extensions that are allowed to make calls through the outbound route.
  • Member Trunks: select the Gamma trunk.

3. Click Save and Apply
Now you can make outbound calls through the Gamma trunk. As the dial patterns configured above, you need to dial “8” before the destination number.
For example, to call the number “4401234567”, you need to dial “84401234567” on your phone.

Configure the Inbound Route with Gamma Trunk

To specify how calls from the Gamma trunk should be routed, you need to configure an inbound route for the SIP trunk.
1. Create an Inbound Route
Go to Settings > PBX > Call Control > Inbound Routes, click Add.

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2. Configure the Inbound Route

Add-Gamma-Inbound-Yeastar-S-Series-PBX
  • Name: give this inbound route a name to help you identify it.
  • Member Trunks: choose the Gamma trunk.
  • Destination: select the destination where the incoming calls will be routed.

3. Click Save and Apply
When you call in the SIP trunk, the call will be routed to the destination configured on the inbound route.

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