Here are the steps you need to follow:

1. Ensure that you have the SlP username and password of the SIP subscription
Login to your account > Click SIP to see the details.
2. Go to 3CX portal 
 If you use 3CX for the first time please check at 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
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
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:
+ +

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

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