RingOffice is a 3CX Certified VoIP Provider. We have been providing SIP Trunks and Business Phone Lines to 3CX customers across Canada and USA since 2010. This guide shows how easy it is to use RingOffice SIP Trunks / Business Phone Lines with 3CX Phone System. This guide was written using 3CX Phone System Version 16.

Set up RingOffice as your VoIP Provider in 3CX Phone System


Here’s a quick and easy guide to set-up RingOffice as your VoIP Provider in 3CX Phone System. This assumes you have already signed up for Business Phone Line / SIP Trunk service with RingOffice and have your credentials handy. If you do not yet have your Service Credentials, sign up for a starter account here.

Step 1 – Add a new SIP Trunk in 3CX

  • Login to your 3CX Management Console/ From the Dashboard screen, click on SIP Trunks.
3CX Phone System V15.5 Dashboard


3CX Phone System V15.5 Dashboard 

  • Click on the “Add SIP Trunk” button


Select RingOffice as VoIP Provider in 3CX Phone 
  • Click Add SIP Trunk Button

Step 2 – Select RingOffice as your VoIP Provider for 3CX Phone System

On the “Add SIP Trunk/VoIP Provider” screen:

Add SIP Trunk/VoIP Provider
  • Select RingOffice as VoIP Provider in 3CX Phone System                                                                                             

In “Country” field select:                          CA

In “Provider” field select:                         RingOffice

  • In “Main Trunk Number” field, enter:  phone number provided by RingOffice
  • Click OK

Step 3 – Configure your RingOffice SIP Trunk in 3CX


On the next screen, you will see detailed configuration for your RingOffice SIP Trunk.

Trunk Details


RingOffice SIP Trunk Incoming Call Routing in 3CX

3CX SIP Trunk Details for RingOffice


  • In the “Trunk Details” section, enter the number of simultaneous calls that your service will allow. This is the number of lines you have subscribed to.

Authentication


3CX SIP Trunk Details for RingOffice

3CX Configure SIP Trunk for RingOffice


  • In the “Authentication” section, you will leave the default “Type of Authentication” as “Register/Account based” and set the following fields:

Authentication ID (aka SIP User ID):  as provided by RingOffice

Authentication Password:                       as provided by RingOffice

3 Way Authentication:                             leave blank

(If you do not yet have your Service Credentials, sign up for a starter account here.)

Route Calls To


3CX Configure SIP Trunk for RingOffice

RingOffice SIP Trunk Incoming Call Routing in 3CX


  • In the “Route calls to” section, you will choose how you want incoming calls to be answered for this new trunk. There are options to set “Destination for calls during office hours” and “Destination for calls outside office hours”. There is also an option to “Set up Specific Office Hours for this trunk”.
  • Click OK and your trunk setup in complete. Your trunk will register with RingOffice and be ready to receive calls.

Configuring Inbound Rules for DIDs

If you have multiple DIDs or phone numbers associated with your trunk, you can add these in the “DIDs” tab in Trunk settings or from the “Inbound Rules” page which can be found in the dashboard menu to the left of your screen. On the “Inbound Rules” page,  you will need to create your desired inbound call routing rules for each specific DID.

Configuring Outbound Rules

To be able to make outbound calls from your new trunk, you will need to make sure there is an Outbound Rule that allows for calls to be routed through your new RingOffice SIP Trunk / Business VoIP Lines. You can check/add this rule from the “Outbound Rules” page which can be found in the dashboard menu to the left of your screen. On the “Outbound Rules” page, if a rule does not already exist allowing calls to your trunk, you will need to create one. The simplest outbound rule must have at least 1 criterion for identifying calls the rule applies to. It must also have at least 1 Route in which you can select your RingOffice SIP Trunk.

3CX Outbound Rule Call Criteria

Outbound Rule Call Criteria

Firewall and Router Configuration


We recommend ensuring SIP ALG or any similar features be disabled in your firewall to ensure that your RingOffice SIP Trunks function properly. You will also want to make sure that your router and firewall are properly configured for 3CX. This guide provides more details on Firewall and Router Configuration in 3CX.