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Configuring China Mobile with 3CX

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Configuring China Mobile with 3CX

About China Mobile

System Preparation

3CX Version

Provider Capabilities

Configure the Trunk with 3CX

Number Format

General

Outbound Caller ID

About China Mobile

China Mobile is one of the largest Chinese telcos. They offer IMS SIP trunks under various provinces, the one that has been tested with 3CX for which the below documentation applies is :

  • China Mobile IMS - Hangzhou province

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 SP2

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): No
  2. Catch All Routing: Yes, static SI per trunk
  3. Fax in T38: No
  4. CLIR (Number Suppression): No
  5. DTMF via RFC 2833: Yes + In-Band
  6. Codec Order: G711A
  7. NAT: Yes

Configure the Trunk with 3CX

You will need to adjust the Registrar hostname and Outbound Proxy IP with the values China Mobile provided.

After, in the “Authentication” section enter your:

- Main number in the “Authentication ID” field.

- Password in the “Authentication Password” field.

- “Main number” “@” ”Registrar hostname” in the “3 Way Authentication Password” field.

Then, specify the number of SIM Calls below as per your contract. 

Number Format

General

When configuring China Mobile SIP Trunks in 3CX, all numbers should be entered in E164 international format.

Outbound Caller ID

China Mobile does not support Clip No Screening, meaning that you can present only your own numbers. Those must be input in E164 format.