Use API to text

I currently use Twilio to send sms message by passing the from phone number and to phone number to twilio and then to the customer.  I write the SMSID to my database.  I then write the response to a record tied to the original SMSID.  I can then reply to the sender thru Twilio from my desktop ap.  This allows me to have the information on my desktop using twilio to send and receive.  Writing each leg to my database.  

If I want off Twilio, how do I do it in RingCentral?