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Connect 3CX PBX to SIP

Here are the steps you need to follow:

1. Add SIP trunk details to 3CX PBX​

  1. Ensure that you have the SlP username and password of the SIP subscription
    Login to your account > Go to SIP > Account to see the details.
  2. Go to 3CX portal
     If you use 3CX for the first time please check at www.3cx.com for more information
  3. Go to SIP TRUNK > Add SIP Trunk
  4. Enter the following information:
  • Name of trunk: add a name or leave the default name 'Generic SIP Trunk'
  • Registrar/Server/Gateway Hostname or IP: SIP domain of your SIP account (log into your portal to check)
  • Outbound Proxy: SIP domain of your SIP account
  • Number of SIM Calls (concurrent call): enter the number of concurrent calls supported by your SIP subscription

**If you leave Outbound Proxy blank, you cannot receive incoming calls.
 

  • Type of Authentication: Register/Account-based
  • Authentication ID (aka SIP User ID): SIP Username of your SIP account
  • Authentication Password: SIP Password of your SIP account Body

   

2. Add dial plan for outgoing calls​

  1. Go to 3CX control panel
  2. Outbound Rules > Add

You can add as many Outbound rules as you need. 
For example, for outbound calls to Singapore:

  • Rule name: Local Singapore.
  • Calls to Numbers with a length of 8

Route: Generic SIP Trunk (or the name of the trunk you created in the above step), Strip Digits 0, prepend 65.After adding this rule, when you dial a number with a length of 8 digits (e.g: 69123456) it will cut no digit and add country code 65 automatically. 
-Input number: 69123456
-Output number: 6569123456

   

3. Configure destination IP phones for incoming calls​

You must configure inbound routes in 3CX PBX in order to receive incoming calls. Follow the steps below:

  1. Go to 3CX control panel
  2. Click Inbound rules
  3. Add DID Rule: Add name, choose DID and set destination IP phones.

   

If you have not set dial plan for your SIP, to make outgoing calls, follow this standard:
<country code> + <area code> + <destination>

For example, if you are calling a Singapore number 1234 5678, key in 65 1234 5678 and call.