How to Get a China SIP Trunk Number

CTS consultants will help you get a China SIP Trunk through legal channels or third-party solutions.

In this guide

1. Introduction 2. Who Can Provide SIP Trunk Service? 3. Comparison Table 4. Business Application Process 5. Technical Connection Setup
Last updated: August 2026

Table of Contents

  1. Introduction
  2. Who Can Provide SIP Trunk Service?
  3. Comparison: Government vs 3rd Party
  4. Business Application Process
  5. Technical Connection Setup

CTS consultants will help you get a China SIP Trunk through legal channels or third-party solutions

China SIP Trunk / China SIP Trunking / SIP Trunk Install / SIP Trunk Setup / China SIP Provider / China SIP Server / China SIP Service

CTS focuses on helping enterprises use VOIP in China mainland, Hong Kong, and Taiwan.

Who Can Provide SIP Trunk Service in China?

  • We have more than 10 years of experience working on China VOIP
  • We focus on serving foreign companies
  • We have resources with all Chinese government telecom providers
  • We have extensive experience in various SIP usage scenarios
Two types of SIP trunk providers in China: Government Telecom Service Provider and 3rd Internet Telecom Service Provider

Figure 1: Two types of SIP trunk providers in China.

Walter Wang, CTS Founder

“Each city and each carrier has different processes and requirements. We’ve done this in Shanghai, Beijing, Shenzhen, and Chengdu — we’ve created a dedicated checklist for each set of materials. If you want to know what your city specifically needs, just ask me directly.”

— Walter Wang, Founder & CEO, CTS China VOIP Consulting

Government Telecom Service Provider

Complex both in technical and business processes

3rd Internet Telecom Service Provider

Flexible and easy for instant use
Provider China Telecom, China Unicom, China Mobile CTS and other providers
Connection Private network
internal connection to provider		 Public network
connection through the internet
Type PSTN/E1/SIP(private) SIP Trunking(public)
Hardware CTS SBC Box with PSTN/E1/SIP module -
Bill payment Postpaid with monthly telecom phone bill Prepaid to 3rd party at first time
Number Owner license License is under the customer's own company Cannot provide owner license
Application time About 10 days after completing the business process 1 day after completing the business process
City number for application All cities in China Specified cities in China
Cost composition One-time Setup fee + number monthly fee + channels monthly fee + CTS service fee + one-time CTS SBC fee One-time Setup fee + number monthly fee + channels monthly fee + CTS service fee

China SIP Trunk Business Application Process

1. Pre-review

Time: About 20 days

Materials required:

  • Business license
  • Bank account license
  • Power of attorney
  • Photocopy of front and back of ID card of the Person in charge
  • Letter of Commitment on Information Security Responsibility
  • Purpose of use and speech description

2. Sign Contract

Time: About 20 days

Materials required:

  • Formal Watermark Protocol
  • Power of attorney
  • Account payment certificate
  • List of numbers
  • Business license

3. Real Name Authentication

Time: About 3 days

Materials required:

  • Business license
  • Power of attorney
  • The person in charge brings their ID card to the business hall for real name authentication
  • The operator comes to the business hall for real authentication

4. Set numbers in CTS server

Time: About 3 days

Description:

  • CTS prepares a dedicated cloud server for customers to connect to the operator's number

5. Number Forward to user

Time: About 3 days

Description:

  • CTS cooperates with the user for debugging numbers

Note: The information required for each operation pre-examination and contract signing in each region will be different. The above are the most basic, and there will be other materials that need to be supplemented. The process of real name will also be different — some need to go to the business hall, some do not; some staff will come to the door, and some do not need to come to the door.

China SIP Trunk Technical Connection

  • Help to provide an SBC device for connection with the telecom provider
  • Help to set up SIP forwarding
  • Help to save your time and increase efficiency
  • Try using the CTS SIP Trunk with standard SIP
China SIP trunk technical connection diagram showing SBC setup with telecom provider

Figure 3: Technical connection diagram.

CTS SBC device for China SIP trunk connection with telecom providers

Figure 4: CTS SBC device.

Ready to Get Your China SIP Trunk?

CTS helps you navigate both government and third-party SIP trunk providers.

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