Twilio's Elastic SIP Trunking now supports blind call transfers, allowing users to initiate a call transfer by sending a SIP REFER message. This feature is enabled on a per-Trunk basis and can be used to transfer calls between agents in different locations. The process involves sending a SIP REFER message from the user's SIP communications infrastructure to Twilio, which then handles the call redirect, freeing up resources in the IP communications infrastructure. To start using this feature, users need to log into the Twilio Console, navigate to an existing Elastic SIP Trunk, and enable Call Transfers under General Settings. Once enabled, users can initiate a transfer by placing a call via their Elastic SIP Trunk and sending a transfer request, which Twilio will then handle according to the call flow that includes a SIP REFER message, a 202 Accepted response from Twilio, and subsequent SIP INVITE and NOTIFY messages.