Log In
menu
Products
Engagement Platform
Mobile Service Cloud
Shared Agent Inbox
Conversational AI Cloud
AI Chatbot & Voicebot
Mobile Marketing Cloud
Marketing Campaigns
Customer Data Platform
Unified Customer Profiles
Connectivity Platform
SMS
Worldwide Text Messaging
Business Messaging API
One API, All Channels
Voice
SIP Trunking & Voice API
Sign
E-Signature Software
Payments Platform
Online Payments
For Webshops & eCommerce
POS Payments
Fixed & Mobile Terminals
QR Payments
Mobile Payments via QR code
Ticketing Platform
Ticketing
Event Ticketing & Registrations
Event App
Festival & Event App
Cash Register
Cashless Payments
Event Marketing
Data Driven Communication
Conversational Channels
WhatsApp Business
Instagram
Facebook Messenger
RCS Business Messaging
Viber
Telegram
Apple Messages for Business
LINE
See all Products
Solutions
By Industry
Charities
Financial Services
Government
Healthcare
Leisure & Travel
Logistics & Transport
Professional Services
Retail & eCommerce
Tech & Media
Utilities & Telco
See all Solutions
By Department
Customer Service
Build exceptional customer service experiences across channels
Marketing & Sales
Personalize and automate marketing and sales communications
IT & Operations
Streamline operational processes and improve digital experiences
Pricing
About Us
Inspiration
Blog
Customer Stories
Downloads
Events
The CM.com Story
Company
Awards & Recognitions
Careers
Investor Relations
Partners
Press
Sustainability
Support
Resources
Developers
Integrations & Plugins
Trust Center
FAQ
Glossary
Knowledge Center
Platform Status
Contact Sales
Sign in
Contact Sales
Knowledge Center
Communications Platform
SIP Trunking
Communications Platform Support
SIP Trunking
General information
Which session interval timer should I use?
For what period can I request Call Detail Records?
What audio codecs are supported (Voice Management)?
What is a CDR, and where can I get it?
How do I send calls anonymously?
SIP INVITE Header format
How do I authenticate when setting up calls through a CM SIP Trunk?
How to blacklist or whitelist destinations (Voice Management)?
Is the T.38 Fax protocol supported?
Can I still connect when my system does not support REGISTER or DIGEST AUTH?
Is the CM Voice platform geo redundant?
What are Concurrent Channel and Calls Per Second limits?
Are calls supported via UDP & TCP?
Getting started
Why is my Voice account blocked
What IP subnet to whitelist SIP trunk
Why and when is a SIP account banned?
Help, my SIP Trunk is blocked! Why and what now?
How to configure a back-up trunk?
How to set up a SIP trunk in the Voice Management application?
How to create a SIP account?
How to set up a flow in Voice FlowBuilder?
CLI (Calling Line Identification)
What is a CLI?
Can I use a mobile number as CLI?
Can I use a service number within NL as CLI?
Do I always have to send a valid CLI with a call?
What phone number formats are supported?
DDI numbers
Cancel phone number subscription
Can I port my existing numbers to CM?
How do I order a new DDI number?
How do I configure a DDI for incoming calls?
Why are incoming calls to my numbers not working?
Integrations (PBX)
How to integrate CM SIP trunk with Asterisk PBX
How to integrate CM SIP trunk with 3CX
Pricing
How is SIP Trunking billed?
How are calls to Dutch premium numbers billed?
Which calls are surcharged with special rates?
How are calls to EU countries with a non-EU CLI billed?
Regulations
SIP Trunking - Regulations Australia (+61)
SIP Trunking - Regulations Belgium (+32)
SIP Trunking - Regulations China (+86)
SIP Trunking - Regulations France (+33)
SIP Trunking - Regulations Hong Kong (+852)
SIP Trunking - Regulations Japan (+81)
SIP Trunking - Regulations The Netherlands (+31)
SIP Trunking - Regulations New Zealand (+64)
SIP Trunking - Regulations Singapore (+65)
SIP Trunking - Regulations South Africa (+27)
SIP Trunking - Regulations Turkey (+90)
SIP Trunking - Regulations United Arabic Emirates (+971)
SIP Trunking - Regulations United Kingdom (+44)
About CM.com
Blog
Pricing
Contact
SIP Trunking
Voice API
Mobile Order
Online Payments
Payment Links
Payment Methods
POS Payments
QR Payments
Recurring Payments
SMS Gateway API
Event Ticketing
Seated Ticketing
Business Messaging API
Cash Register
Chatbots
Connectivity Platform
Conversational Channels
Customer Data Platform
Email Campaigns
Event & Festival App
Mobile Marketing Cloud
Mobile Service Cloud
One Time Password
Payments Platform
Sign
Ticketing
Two-Way Messaging
Voice Campaigns
Privacy Statement
Terms and conditions
Cookie Policy
Sitemap
Investor Relations
