Specify your SMS fallback sender when sending RCS messages

You can now specify the SMS or MMS sender Twilio uses when an RCS message fails to deliver using the new "FallbackFrom" parameter in your /Messages API request. The FallbackFrom sender must be in the same account SID, but does not need to be in your Messaging Service's sender pool.

This can be useful if you need fallback messages to come from a specific number, instead of relying on Twilio's automatic selection. You can also use this to send from one RCS sender representing your brand, with different fallback numbers per department, store, or representative.

For more information, please see our docs.