TryLearn More

Use SIP trunks, WebRTC & Apps

Slash your Phone Bill by 80%

Zen Business Talk SIP - SIP Trunk

On this topic

Zen Business Talk SIP - SIP Trunk

About Zen Business

System Preparation

3CX Version

Provider Capabilities

Configuring the Trunk with 3CX

Adding the Trunk

Adding Additional DIDs

Creating Inbound Rules

Number Format

General

Outbound Caller ID

Outbound Rules

About Zen Business

Zen Business Talk SIP Trunking provides a low-cost, flexible solution to 3CX customers in the UK. With over 20 years of experience offering data, voice and hosting services, Zen is able to deliver a reliable solution based on businesses individual needs.

Reference website: Zen SIP Trunking

System Preparation

Before configuring the SIP trunk it is required to go through the following checklist and make changes where necessary:

Further setup information can be found in our Academy: 3CX Academy Basic course

3CX Version

Some providers gained support and compatibility with 3CX on a specific product version. It is advisable to always run the latest version of 3CX to ensure ongoing compatibility.

Minimum 3CX Version: 3CX Phone System 15.5 SP1

Provider Capabilities

Below is a short overview of the provider's capabilities and services and whether they’re supported or not:

  • CLNS (Clip No Screening): No
  • Catch All Routing: Yes, static SI per trunk
  • Fax T.38 support: No (G711 passthrough only)
  • CLIR (Number Suppression):        No
  • DTMF via RFC 2833:        Yes
  • Codec Order: G711U, G711A, GSM
  • NAT Support: Yes
  • SRTP - No

Configuring the Trunk with 3CX

The general instructions outlining how to add a new SIP Trunk to your 3CX installation can be found here.

Adding the Trunk

Go to “SIP Trunks” and select “Add SIP Trunk”

  • Select Country: UK
  • Select Provider in your Country: Zen Business Talk SIP
  • Main trunk number: This will have been provided to you by Zen Business. You must enter the number in the UK National number format (e.g. 02033272020)
  • Press OK

Under the “General” tab in the “Authentication” section enter your Authentication ID and password (these will be supplied to you by Zen Business).

Once you have filled in the Authentication ID and Password given to you by Zen, scroll to the top of the page and press OK. At this point if you refresh the page you should see your Zen Trunk appear as Registered.

Adding Additional DIDs

To associate all other DIDs/Numbers you have in your Zen Business account with 3CX, go to the Management Console → SIP Trunks, double-click on your Zen Business Trunk and go to the “DIDs” tab.

Here you should already see 1 entry that is the Main Trunk number you have set. Add all other DIDs/Numbers you have to the list in a National UK Number format (e.g. 02033272020) and press OK once you have finished.

Creating Inbound Rules

Now that you have associated all your DIDs/Numbers with your SIP Trunk in 3CX, you can create Inbound Rules to set where calls will be routed when those numbers are called. Instructions on how to create Inbound Rules can be found here.

Number Format

General

When configuring Zen Business Talk SIP Trunks in 3CX, all numbers should be entered in the UK National number format (e.g. 02033272020), otherwise calls will fail.

Outbound Caller ID

Zen Business SIP Trunks do not support Clip No Screening which means you can only present

DID’s that are registered under the trunk. To do this you will need to format the DIDs to the UK National number format (e.g. 02033272020), but not starting with 09.

Outbound Rules

When configuring your Outbound Rules make sure that all numbers are dialed either in the National (e.g. 02033272020) or International format (e.g. 00442033272020). Numbers dialed in any other format (e.g. +442033272020) will be rejected.

More information about how to create Outbound Rules and how they work can be found here.

Free for up to 1 year! Select preferred deployment:

On-Premise

for Linux on a $200 appliance or as a VM

Get the ISO

On-Premise

for Windows as a VM

Download the setup file

On the cloud

In your Google, Amazon, Azure account

Take the PBX Express