Telnyx is a cloud communications platform that allows you to send and receive SMS messages through its carrier-grade network. With respond.io, you can manage both Telnyx SMS and Telnyx Calls in one place.
Requirements
Before you connect Telnyx SMS to respond.io, ensure you have:
An active Telnyx account
A Telnyx phone number with SMS capability
Setting up Telnyx SMS
Sign in to your Telnyx account.
Purchase or use an existing Telnyx phone number that supports SMS.
In the Telnyx Portal, go to Real-Time Communications > Numbers > Buy Numbers.
Filter for numbers with SMS capability.
Complete the purchase.
Connecting Telnyx SMS to respond.io

In respond.io, go to Workspace Settings > Add Channel.
Locate the Telnyx SMS Channel and click Connect.
Select the Telnyx phone number you want to use.
Click Save Changes to complete the setup.
Once connected, any SMS sent to your Telnyx number will appear in your Workspace.
Channel configuration
You can configure your Telnyx SMS Channel name for internal reference:

Go to Workspace Settings > Channels.
Locate the Telnyx SMS Channel> Click Manage > Account.
Enter your preferred Channel Name.
Save changes.
Notes & limitations
File Size Limits: Images, audio, and video up to 1MB each.
Message Status: Sent, Delivered, and Failed are supported; Read status is not available.
Phone number masking is not available for Telnyx SMS.
Broadcasts eligibility
Telnyx SMS broadcasts can only be sent to Contacts who have previously sent or received a message through the Telnyx SMS Channel.
Since broadcasts are limited to Contacts with prior Telnyx SMS interaction, you may notice the following:
Segments: Segments may include Contacts who have never messaged you via Telnyx SMS, but those Contacts will not receive broadcasts.
Reports: Sent and delivered metrics may be lower than the total number of Contacts in the selected Segment.
Contact filtering: Filtering by the Telnyx SMS Channel only shows Contacts with existing Telnyx SMS interaction history.
Note: Contacts activated through Telnyx calls may not be included in SMS broadcasts, since only Contacts with prior messaging interaction are eligible.