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    SIP integration own phone number

    Use your own phone number with a smart assistant? Use the SIP integration of Hey Fred.

    Gepubliceerd op 18 januari 2026

    With a SIP integration (Session Initiation Protocol), you can link your own phone number and existing phone system to the AI assistants of HeyFred. Think of it as a bridge between your current telephony infrastructure and our platform. This means that you:

    • Can continue to use your existing phone number(s) with our AI assistants
    • Can keep your current phone system and provider
    • Can make and receive calls through your existing setup, but with AI functionality
    • Retain full control over your numbers
    • Can make calls with your own VoIP provider at local, lower rates
    AI Assistant SIP integration

    How it works

    What are the advantages and possibilities when you link your own phone number with HeyFred via a SIP integration?

    Incoming calls : When people call your existing phone number, these are forwarded via the SIP integration to the AI assistant of HeyFred

    Outgoing calls : Your AI assistant can make outgoing calls with your own number.

    Management : You continue to manage your numbers through your current provider.

    Cost savings : You benefit from competitive rates from your VoIP provider and the advantages of an AI assistant via our platform .


    Integration options

    You can connect your phone number and phone system to Heyfred.nl in two ways:


    1. PBX extension integration

    This works as if you give our AI platform an “extension” on your phone system. Perfect for:

    • testing the integration and your AI assistant
    • Routing specific extensions to the AI assistant
    • Simple setup with existing telephone systems


    What you need:

    • Your extension number (e.g., 201)
    • Username and password of the extension
    • The address of your PBX server (e.g., pbx.yourcompany.com)


    Example:

    Your office has extensions 200-299 for staff. You create extension 201 for the AI assistant. Calls to 201 go to the AI and the AI can make outgoing calls with number 201.


    Direct number / SIP Integration

    This connects a phone number directly to the platform. Perfect for:

    • Dedicated AI phone lines
    • Customer service or sales lines

    What you need:

    • Your phone number (e.g. +31 20 987 56 34)
    • SIP details from your provider
    • The SIP server address from your provider

    Example :

    You have a phone number +31 20 987 56 34. You link this number to our platform and your AI assistant. Then:

    • All incoming calls to +31 20 987 56 34 will be answered by the AI assistant.
    • The AI can make outgoing calls showing +31 20 987 56 34 as the caller.

    Authentication and conversation flow

    Bidirectional configuration

    In SIP integration, the same login credentials are used for incoming and outgoing calls:

    Inbound (VoIP → Heyfred.nl):

    • Your VoIP system authenticates with username/password
    • Calls reach the platform
    • The AI assistant answers

    Outbound (Heyfred.nl → VoIP):

    • The AI initiates the call via your SIP
    • The platform authenticates to your VoIP provider with the same login credentials
    • The call reaches its destination

    Credential synchronization

    For correct operation, you must ensure that:

    1. The login credentials in the Heyfred.nl dashboard exactly match your VoIP configuration.
    2. Username and password for inbound and outbound are the same.
    3. If you change your password with your VoIP provider, you also update it in app.heyfred.nl (and vice versa).

    1. Collect your data

    • PBX extension: extension number, server address, username and password 
    • Direct number: phone number, SIP server address, username and password

    2. Configure in the dashboard

    • Go to your Heyfred.nl dashboard
    • Navigate to your phone numbers
    • Click on “Integrate SIP trunk”

    3. Select the type of SIP trunk

    • SIP extension for existing SIP login credentials
    • Phone number (DID) for a directly connected number

    4. Outbound settings

    • Enter your provider's SIP address
    • Optional: enable Outbound Proxy if your provider requires fixed IPs

    5. Number format configuration

    • Choose the format in which your provider accepts phone numbers (international with +, without + or national)

    6. Inbound settings

    • Heyfred.nl provides a unique inbound SIP URI
    • Your provider must route inbound calls to this URI via SIP

    7. Select country

    • Indicate in which country your SIP trunk is provisioned

    8. Verify setup

    • Test an incoming call
    • Check that the AI assistant answers
    • Test an outgoing call

    door Ontwikkelaars, voor Iedereen

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