def sip_endpoint(self) -> str:
        """Get the SIP endpoint URI if available.

        Returns:
            str: SIP endpoint URI or empty string if not available
        """
        if not self.sip_uri:
            return ""
        else:
            return "sip:%s" % self.sip_uri["endpoint"]
Get the SIP endpoint URI if available.

        Returns:
            str: SIP endpoint URI or empty string if not available
        
src/pipecat/transports/services/helpers/daily_rest.py