import { EventEmitter } from 'events';
export interface VoiceCallConfig {
    provider: 'twilio' | 'vonage' | 'webrtc' | 'sip';
    credentials?: Record<string, string>;
    sttProvider?: string;
    ttsProvider?: string;
}
export declare class VoiceCallManager extends EventEmitter {
    private config;
    private calls;
    private audioListeners;
    constructor(config: VoiceCallConfig);
    private ensureCredentials;
    startCall(to: string): Promise<string>;
    endCall(callId: string): Promise<void>;
    onIncoming(callback: (callId: string, from: string) => void): void;
    simulateIncoming(from: string): string;
    sendAudio(callId: string, audio: Buffer): Promise<void>;
    onAudio(callId: string, callback: (audio: Buffer) => void): void;
    getCallStatus(callId: string): 'ringing' | 'active' | 'ended';
    listActiveCalls(): Array<{
        callId: string;
        from: string;
        startedAt: number;
    }>;
}
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