/**
 * Download audio file from URL
 */
export declare function downloadAudioFile(url: string): Promise<Buffer>;
/**
 * Convert audio buffer to PCMU (G.711 mu-law) format
 */
export declare function convertAudioToPCMU(audioBuffer: Buffer, outputPath: string): Promise<void>;
/**
 * Read PCMU audio from WAV file and return as base64 chunks
 */
export declare function readPCMUFromWAV(wavPath: string): string[];
/**
 * Stream audio file through media stream WebSocket
 */
export declare function streamAudioFile(connection: any, // WebSocket connection
streamSid: string, audioUrl: string, latestMediaTimestampRef: {
    current: number;
}, isConnectionClosed: () => boolean, tempDir: string): Promise<void>;
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