@Mad SIP, or Session Initiation Protocol, allows VAPI to manage voice calls over the internet. With SIP integration in VAPI, you can: 1. **SIP Origination**: Receive incoming calls from SIP devices or networks. You can specify the destination SIP address using the

sipUri

attribute within the

forwardingPhoneNumbers

array to route these calls appropriately. 2. **SIP REFER**: Transfer ongoing SIP calls to another SIP endpoint. VAPI utilizes the SIP REFER method, which means your receiving system should be configured to handle SIP REFER messages for smooth call transfers. These capabilities enable you to build flexible and scalable voice applications that can interact with SIP-enabled devices and services.

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