Call Recording Storage Calculator

Storage depends on three factors: codec, call duration, and call volume. A G.711-encoded call (the most common codec for PSTN/VoIP) uses 64 kbps of data — roughly 0.47 MB per minute or 2.3 MB for a 5-minute call. At 300 calls/day on 22 working days, that is 15 GB per month. G.729 compresses to 8 kbps — 8x smaller — at the cost of some audio quality. Opus (32 kbps) splits the difference with excellent quality and roughly 75% less storage than G.711. Stereo recording (both channel legs separate) doubles storage.

G.729 uses the least storage at 8 kbps — approximately 8x less than G.711 and 4x less than Opus. However, G.729 introduces perceptible audio compression artifacts that can make it harder to use recordings for quality monitoring, compliance review, or dispute resolution. Opus at 32 kbps offers a strong balance: 50% less storage than G.711 with near-transparent audio quality. Most compliance-sensitive industries use G.711 or Opus to ensure recordings are legally usable.

Retention requirements vary by industry and jurisdiction. HIPAA (healthcare) requires a minimum of 6 years for records related to patient care, though call recordings are often treated as 6 months–2 years in practice. Financial services under MiFID II (EU) and FINRA Rule 3110 (US) require 5–7 years. PCI-DSS prohibits storing sensitive authentication data but does not mandate a specific retention period for call recordings. General business call recordings have no federal minimum in the US, though state laws vary. Always consult legal counsel for your specific situation.

G.711 (PCM, 64 kbps): The original telephone codec — uncompressed, highest audio quality, largest file size. Standard for PSTN and most VoIP deployments. G.729 (8 kbps): Lossy compression that achieves excellent speech intelligibility at 8x smaller file size. Widely used in SIP trunking to reduce bandwidth. Some quality loss noticeable under close review. Opus (6–510 kbps, typically 32 kbps for voice): Open-source, modern codec. Outperforms G.729 at similar bitrates and rivals G.711 quality at 32 kbps. Growing adoption in WebRTC and cloud contact centers. Stereo G.711 records both call legs on separate channels — essential for certain compliance use cases where per-party audio must be independently auditable.

Five strategies reduce recording storage costs significantly: (1) Switch from G.711 to Opus — saves ~50% storage with negligible quality impact. (2) Selective recording — record 100% of compliance-sensitive queues but only sample (10–20%) of routine queues. (3) Tiered storage — move recordings from hot storage to cold/archive storage (e.g., AWS Glacier at $0.004/GB vs $0.023/GB for S3) after 30–90 days while maintaining access for compliance review. (4) Shorter mono recording — avoid stereo unless required. (5) Silence trimming — some systems can strip hold music and silence, reducing effective file size 15–30%.

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