Twilio using a local number I already have -

hi have local landline number , mobile number, possible twilio make outgoing call thru mobile number or landline number have ? way customers call our office number ?

yes , no. twilio can make callerid show number have verified, actual call made number billing purposes.

https://www.twilio.com/help/faq/voice/can-i-use-a-non-twilio-number-as-the-caller-id-for-outgoing-calls

can use non-twilio number caller id outgoing calls?

yes, verify number twilio. verification takes few seconds, , proves have authority use phone number. sorry, no prank calls bro’s phone number! once phone number has been verified, can used ‘callerid’ attribute outbound calls.