Yes, it’s doable, but the main challenge is how RingCentral handles SIP registration versus how Retell manages call control. Most issues come from codec mismatch, NAT, or RingCentral rejecting re-INVITEs during transfers. The clean approach is registering Retell as a SIP device and letting RingCentral stay in charge of routing. Are you trying to have the AI answer first and then transfer to a human, or keep everything AI-handled end to end? @Prodestinados