Introducing SIP Registration allows users to connect their SIP-enabled devices or softphones directly to Twilio's Voice API for call-handling logic and routing control from their code, with free registration for multiple devices per user. The feature is available now and uses the same Programmable Voice pricing for making and receiving calls. Early adopters include Serenova, which integrated SIP Registration into its contact center offering, allowing agents to use SIP-enabled phones in any location without local infrastructure. Twilio also utilizes SIP Registration internally, saving 80% on VoIP provider fees by registering their office phones directly with Twilio.