MMS Gateway - SignalWire

The SignalWire MMS Gateway currently delivers MMS messages to USA and Canadian phone numbers. You can use the following methods for attaching media files to your outgoing messages:

  • Public URL: simply enter the publicly accessible URL for each media file that you wish to send. You would typically upload the file (jpeg, png etc) to a server and determine the URL to that file and enter this into the URL field when sending an MMS message.
  • Get Media Record URL: using the supplied getMediaURL.php file (versions for both the FileMaker Data API and the FileMaker PHP API are included) you can generate a dynamic URL on the fly that SignalWire can use to download a media file from the container field in the Media table record. This requires the fmMMS file to be hosted on FileMaker Server or FileMaker Cloud for AWS.

You can get further information on supported media files and limitations here:

https://docs.signalwire.com/topics/laml-xml/#messaging-laml-overview-mime-types

Incoming Messages/Replies

You can get incoming messages/replies to your SignalWire number into the fmMMS file in 2 ways:

  • Manually Download Incoming Messages
  • Use Webhooks to have SignalWire push these automatically to fmMMS

Using Webhooks is the preferred method as it saves you from having to poll/check for any new messages - with Webhooks new messages are forward to fmMMS automatically by SignalWire as they are received.

Manual Download Incoming Messages

You can download incoming messages manually via the Account Details screen. Simply enter the date range you wish to download messages between and click the Get Incoming Messages button:

Any incoming messages to your SignalWire number that have not been previously downloaded will then be downloaded, including any media attachments. You could also setup a FileMaker Server script schedule to have this run on a scheduled basis (e.g.every hour) to save you from having to manually download/check for new messages.

SignalWire Webhooks Setup

To receive incoming MMS messages to your SignalWire number, including replies to previously sent messages, you will need to use the supplied WebhooksIncomingMessages.php webhook file to act as the webhook receiver. See our Webhooks guide for what you need to do host the WebhooksIncomingMessages.php file on your chosen web server. Once you have the publicly accessible URL for this file you can enter this into your SignalWire account settings as follows:

  1. login to your SignalWire account via their website
  2. on the Dashboard click on the SignalWire Phone Number you wish to attach the webhook to
  3. click the Edit Settings button, then under Messaging Settings select Handle Messages using LaML Webhooks
  4. in the When a Message Comes In field enter the URL in the adjacent field
  5. set the HTTP method to POST.
  6. click Save

It should look similar to this screenshot:

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