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Sinch SMS Provider Configuration

FS PBX supports two-way SMS through Sinch, using the Sinch (Inteliquent) message broker API for outbound messages and a secure inbound webhook for receiving messages. This guide explains how to configure your Sinch credentials, set up inbound security, and enable SMS for phone numbers.

1. Required Environment Variables​

Add the following environment variables to your .env:

SINCH_AUTH_ID=
SINCH_API_KEY=
SINCH_MESSAGE_BROKER_URL=https://messagebroker.inteliquent.com/msgbroker/rest
SINCH_INBOUND_API_KEY=

Description of Each Variable​

VariablePurpose
SINCH_AUTH_IDSinch authentication ID used for outbound SMS API requests.
SINCH_API_KEYAPI key paired with the Auth ID.
SINCH_MESSAGE_BROKER_URLEndpoint used for sending outbound SMS messages. Default: https://messagebroker.inteliquent.com/msgbroker/rest
SINCH_INBOUND_API_KEYSecret key used to validate inbound Sinch webhook requests. Prevents spoofing.

Note: Sinch requires custom authentication for outbound delivery and a secure API key for inbound webhook validation.

2. Apply Configuration Changes​

After entering your .env values, refresh the Laravel config cache:

php artisan config:cache

If you skip this step, FS PBX will not load your updated Sinch configuration.

3. Webhook Setup (Required)​

Sinch delivers inbound SMS messages and status callbacks via webhook.
To ensure FS PBX receives inbound messages correctly, configure Sinch to send all SMS webhooks to:

https://your-domain/webhook/sinch/sms

Sinch Inbound Webhook Security​

FS PBX uses the environment variable:

SINCH_INBOUND_API_KEY=

to verify inbound webhook requests.

If this value is set:

  • Sinch must include the same key in its webhook request header (typically X-API-Key or similar)

  • FS PBX will reject requests with mismatched or missing keys

This ensures only messages from Sinch are accepted.

Where to Configure in Sinch​

Depending on your Sinch/Inteliquent account:

  1. Log in to your Sinch/Inteliquent portal

  2. Navigate to:

    • Messaging → SMS Settings, or

    • Numbers → SMS Configuration, or

    • Message Broker Settings

  3. Set:

    • Inbound Message URL → https://your-domain/webhook/sinch/sms

    • Status Callback URL → same endpoint (optional)

  4. Ensure your inbound secret/API key matches SINCH_INBOUND_API_KEY

4. Enable SMS on a Phone Number in FS PBX​

Once Sinch is configured and webhooks are set:

  1. Navigate to Advanced → Message Settings

  2. Add or edit the phone number you want to SMS-enable

  3. Select Sinch as the provider

  4. Assign an extension (recommended)

    • Inbound messages will appear in the FS PBX mobile app for that extension

  5. Optionally assign an email address for read-only email notifications

From this point:

  • Inbound messages → Sinch → FS PBX → Mobile App

  • Outbound replies → Mobile App → Sinch → Recipient

Summary​

To configure Sinch SMS support in FS PBX:

  1. Add credentials to .env

  2. Run php artisan config:cache

  3. Configure Sinch webhooks to point to /webhook/sinch/sms

  4. SMS-enable each phone number in Message Settings and select Sinch

Your Sinch-enabled numbers are now fully capable of two-way SMS messaging.