Creating a Transport Layer Security Connection between Vodia and Telnyx

Published on:

June 30, 2023

This comprehensive guide outlines the setup of a secure Transport Layer Security (TLS) connection between Vodia and Telnyx, emphasizing the crucial aspects of data confidentiality and integrity. By following the steps provided, users can establish a secure SIP trunk connection. This TLS connection guarantees encrypted and secure communication, enhancing data protection and privacy for your business.

In this blog we guide you through the process of setting up a TLS connection between Vodia and Telnyx. Transport Layer Security (TLS) provides secure communication over the Internet, ensuring the confidentiality and integrity of data exchanged between the two systems; by following the stops below, you can establish a secure connection for your SIP trunk.

Connecting with Telnyx 

Create a SIP registration connection in Telnyx. 

Step 1: Connecting with Telnyx

Create a SIP registration connection in Telnyx.

  • Choose "Registration" as the type, then copy your SIP password.
  • The SIP password will be required when setting up the SIP trunk on the Vodia phone system.
  • Save and finish the registration.
Create a SIP Connection with Telnyx
Register a SIP Connection with Telnyx
  • Edit the connection and enable Secure Real-Time Transport Protocol (SRTP) under "Encrypted Media."
  • Save the configuration.

Note: Outbound settings already utilize SRTP settings from the inbound settings. 

Edit SIP Connection to enable SRTP

Step 2: Configuring the Vodia Phone System

  1. Navigate to the SIP trunk to create your Telnyx connection in the Vodia phone system.
  2. Click on "Add" and select "Telnyx."
  3. Enter your Telnyx SIP account details:
    • Name: Provide a name for your trunk.
    • Password: Enter your Telnyx SIP credentials.
    • User: Enter your Telnyx user account.
    • DID: If applicable, enter your Direct Inward Dialing (DID) number.
    • Save the configuration.
  4. Configure TLS under "Proxy Address" by using the following example:
    • Proxy Address:;transport=tls

Navigate to the SIP trunk to create your Telnyx connection: Click on “Add” and select "Telnyx." 

Choose Telnyx from the service provider trunk list
Add password to create a SIP Connection with a service provider trunk

Configure the TLS under "Proxy Address" by using the following example:

  • Proxy Address:;transport=tls
Proxy Address to configure TLS

Step 3: Caller ID and Phone Numbers 

To define the Caller ID used when making calls from the Vodia system, follow these steps:

  1. Define the FROM headers and Remote Party ID under the SIP caller-ID presentation:
    • Choose "custom headers" from your Telnyx SIP trunk.
    • You can set up the Domain ANI in the Tenant general settings under "dom_settings.htm."
    • Alternatively, you can set up an ANI on the extension and instruct the header to use "Extension ANI."
  2. Save the settings.

Note: Read more information about Vodia tenant level.

SIP caller-ID Presentation

By following the above steps, you can establish a TLS connection between Vodia and Telnyx, ensuring secure and encrypted communication for your SIP trunk; this added layer of security helps protect your data and ensures the privacy of your calls. Implementing TLS is a crucial step in maintaining a secure communication infrastructure for your business.

Sample inbound show TLS 

INVITE sip:9787368016@;transport=tls;line=02522a2b SIP/2.0 Record-Route: <sip:;transport=tls;r2=on;lr;ftag=jBpNrQtFDFegp> Record-Route: <sip:;transport=tls;r2=on;lr;ftag=jBpNrQtFDFegp> Record-Route: <sip:;transport=tls;r2=on;lr;tnx=461.748> Record-Route: <sip:;r2=on;lr;tnx=461.748>

Sample outbound show 

INVITE sip:4001@;transport=tls;line=shb07dy9;wrtc=true SIP/2.0 Via: SIP/2.0/TLS;branch=z9hG4bK-0fda88b9200ab8e60062fc693972f2e8;rport

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