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SIP Trunk

A SIP Trunk is a set of configurations that allow you to customize how your application routes and manages calls. You can create and manage your trunks at https://platform.frejun.ai/app/sip-trunks.

Steps to configure a SIP Trunk​

1. Create a Trunk​

  1. Click on the Create trunk button to configure a SIP Trunk.

2. Basic Information​

  1. Name:
    • Provide a custom name for your trunk.
    • This is for your internal identification and can be anything meaningful to you.
  2. Domain Name:
    • The unique domain assigned to your trunk.
    • All outbound calls will be routed to this domain — also referred to as the Termination URL.
    • Only alphanumeric characters and hyphens are allowed (Special characters are not supported).
    • Example: 
      Domain name: teler
  3. Channel Limit:
    • Defines how many concurrent calls your trunk can handle.
    • Default limit is 1 channel.
    • You can purchase additional channels based on your expected call volume.
  4. Recording:
    • Enable this option if you want call recordings.
    • When enabled, all call audio will be captured and made available in your dashboard.
  5. Secure:
    • Controls whether SIP signaling and media are encrypted.
    • If enabled:
      • SIP signaling uses SIP/TLS.
      • Media (audio) is encrypted using SRTP.
    • If disabled:
      • SIP signaling uses TCP.
      • Media is transmitted via RTP (unencrypted).

3. Outbound Authentication​

You can choose one of the following authentication methods for outbound calls.

  1. IP Authentication:

    • Use this if your system sends outbound calls from fixed, static IP addresses.
    • You can add up to 3 IP addresses.
    • Any call originating from these IPs will be automatically authenticated by Teler.

  2. Credential Authentication:

    • Use this if your system uses a username and password for SIP authentication.
    • Enter your desired credentials here and configure the same credentials in your system’s SIP Trunk settings.
    • For username alphanumeric characters and hyphens are allowed.
    • Example: 
      username: teler
      password: teler123
info

IP-based authentication is not recommended, as it can cause call routing issues—especially when outbound calls originate from changing or unpredictable public IPs.

4. Inbound Routing​

  1. Name:
    • Provide a custom name for your inbound route.
  2. SIP URL:
    • The SIP URL where Teler should deliver inbound calls, also known as the Origination URL.
    • When someone calls Teler number, the call will be routed to this SIP URL.
    • This URL is provided by your SIP-compatible platform (AI provider, PBX, SBC, softswitch, etc.).
    • Example: 
      SIP URL of Elevenlabs: sip:sip.rtc.elevenlabs.io:5061