@Tremix thanks for responding. We use a custom LLM in conjuction with the Retell infra to control our agents. We want to move to Twilio to use the same phone number in other use cases (beyond just handling our calls - ex: SMSing). Maintaining the same phone number is crucial for our user experience as we make this migration. Is there anyway to just move the phone number into our twilio account so that we can control the SIP trunks/SMS config/campaigns etc. while retaining our use with Retell (We are more than happy to put in the work to do the manual SIP trunking with Retell instead of our current OOTB functionality). please advise

Hey Jake, I get why this matters. Keeping the same number while expanding into SMS and other flows is a big UX thing. Yes, it’s doable. You can port the number into Twilio, let Twilio fully own voice + SMS, and then connect Retell via a custom SIP trunk instead of the out-of-the-box setup. It’s more manual work, but it gives you full control over routing, campaigns, and future use cases. The main things to plan for are SIP call flow, headers, and making sure latency and failover are handled cleanly. One quick question: do you need two-way SMS live immediately on that number, or can voice be the first step? @Jake