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Configuring Voiceflex SIP trunk in 3CX

Voiceflex - SIP Trunk

On this topic

Voiceflex - SIP Trunk

About Voiceflex

System Preparation

3CX Version

Provider Capabilities

Provider Portal

Setup & Collecting 3CX Configuration Settings

Configuring the Trunk with 3CX

Adding the Trunk

Adding Additional DIDs

Creating Inbound Rules

Number Format

General

Outbound Caller ID

Outbound Rules

About Voiceflex

Voiceflex has been a leading UK provider of voice products for over 10 years. They offer a number of SIP, data and hosted services and we have now tested Voiceflex’s SIP trunking product for use with 3CX 15.5.

Reference Web Address: Voiceflex

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

Provider Capabilities

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

  1. CLNS (Clip No Screening): Yes
  2. Catch All Routing: Yes, static SI per trunk
  3. Fax in T38: Yes (Bypass - No upscaling)
  4. CLIR (Number Suppression):        Yes
  5. DTMF via RFC 2833:        Yes
  6. Codec Order: G711U, G711A, G729
  7. NAT Support: Yes

Provider Portal

In order to use Voiceflex trunks with 3CX, some settings must be made within the provider's portal and some information is required to complete the configuration with 3CX.

The portal can be accessed here with the credentials given to you by Voiceflex.

Setup & Collecting 3CX Configuration Settings

Once you have logged into the portal, go to “Services”“SIP Accounts”. Here you will see a list of all the accounts you have been allocated by Voiceflex. Make a note of the:

  • SIP Trunk ID
  • Bearer Number
  • SIP Server

as these will be used later in this guide to configure the Voiceflex Trunk in 3CX.

Next press the “Edit” button. Also make note of the value in the “Password” field as that will also be needed later in this guide.

After collecting this information, go to “Services”“Numbers and Programming”. Here you will see a list of the DIDs you have been allocated by Voiceflex.

Select the DIDs you want to use with your 3CX installation including the “Bearer Number” which you made note of above.

With the DIDs you want to use selected, press on “SIP Trunk”. In the window that will open find the SIP Trunk ID from the list, then press OK.

While you still have DIDs selected, now press “Invite Format” and from the drop-down select “DDI: E.164 (canonical with plus)”, then press OK.

The end result after doing the above should be similar to this:

At this point you have collected all required information are ready to configure your Voiceflex Trunk in 3CX.

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

Specifically, to add Voiceflex to 3CX, go to “SIP Trunks” and here press “Add SIP Trunk”. From the “Country” drop-down select UK and then “Voiceflex”. In the “Main Trunk No” field enter the Bearer Number that you collected in the previous section of this guide, Setup & Collecting 3CX Configuration Settings, then press OK. The number must be written in the full E.164 format including the plus sign, e.g. +442033272020.

In the “General”“Trunk Details” section, in the “Registrar” field enter the SIP Server that you have collected from the Voiceflex Portal.

Additionally, in the “Authentication ID” and “Authentication Password” fields, enter the SIP Trunk ID and Password values as collected in the Setup & Collecting 3CX Configuration Settings section.

Once you have done the above, press OK at the top of the page and your Voiceflex SIP Trunk will be successfully configured.

Adding Additional DIDs

To associate all other DIDs/Numbers you have in your Voiceflex account with 3CX, what you need to do is go to the “Management Console → SIP Trunks”, double-click on your Voiceflex 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/Number must be inserted in the E.164 including the plus sign (e.g. +442033272020) and press OK once you have finished.

Creating Inbound Rules

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

Number Format

General

When configuring Voiceflex SIP Trunks in 3CX, all numbers should be entered in the full E.164 format including the plus sign otherwise calls will be rejected and call routing might not work as intended.

Outbound Caller ID

Voiceflex SIP Trunks supports Clip No Screening (CNS) which means you can present any number you want when calling outbound.

Outbound Rules

There are no special instructions regarding Outbound Rules that are required, numbers can be dialed either in the International format (00) or in National format (0).

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

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