API to post SMS to Freshworks CRM?

There exists API endpoints to log a manual phone call in CRM:

POST api\phone_calls

We use a 3rd party system to send SMS, is there an API endpoint to post these SMS back into CRM?

When I perform a GET on api\selector\sales_activity_types it returns SMS Outgoing and SMS Incoming, but when i post to these ID’s I get an invalid sales activity ID.