export declare const REALTIME_VOICE_PROTO_NOT_CONFIGURED = "proto_not_configured";
export declare const REALTIME_VOICE_TRANSPORT_NOT_CONFIGURED = "transport_not_configured";
export declare class RealtimeVoiceNotConfiguredError extends Error {
    readonly code: string;
    constructor(code: string, message: string);
}
export declare function protoNotConfigured(detail: string): never;
export declare function transportNotConfigured(): never;
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