twilio - Twillio SMS Calls Flow -

i'm writing code process sms twilio , i'm not sure understand messages flow documentation.

when initiate message

• i use the twiliorestclient make request
• the request returns synchronously, , sid can use keep track of message
• i callbacks status callback url telling me what's status of message, can identify using sid got previously

when incoming message

• i process incoming message , reply twiml response message
• i don't response's sid
• do status call response? if do, how know of responses status belongs?

after digging in documentation noticed there's action attribute message, url used callback. 1 possible solution assign internal id response , add query parameter callback url.