--- title: Migrate a Legacy Call Recorder Without Losing a Call | CoreCx AI url: https://www.corecx.ai/insights/leave-a-legacy-call-recorder-without-losing-a-call/ description: The six checks behind a zero-miss call recording migration: inventory, read-only extraction, call-by-call reconciliation, playback proof and audit sign-off. publisher: CORECXAI PTE. LTD. updated: 2026-11-02 --- Playbook # Leaving a legacy recorder without losing a call The six checks behind a zero-miss call recording migration, from the first inventory to the auditor's sign-off. 31 October 2026 · 6 min read · CoreCx AI **In this playbook**[Why recording migrations go wrong](#)[Check 1: Inventory the source](#)[Check 2: Read only, never write](#)[Check 3: Reconcile call by call](#)[Check 4: Prove every file plays](#)[Check 5: Keep the context and the holds](#)[Check 6: Sign off with evidence](#)[After the migration](#)[How CoreCx does it](#) [All insights](https://www.corecx.ai/insights/) ## Why recording migrations go wrong Legacy call recorders hold years of regulated conversations, often in proprietary formats, spread across sites and storage tiers. The common failure is not a crash. It is a quiet gap: calls that were never copied, files that copied but will not play, or recordings that lost the agent, direction or legal hold that made them useful. Nobody notices until a complaint or an investigation asks for a call that is no longer there. ## Check 1: Inventory the source Count what you have before you move anything: recordings by year, site, channel and storage tier, plus the retention rule and any legal holds that apply to each. This count is the number the migration will be measured against. ## Check 2: Read only, never write Connect to the legacy recorder and its database with read-only access. The source must stay untouched until the migration is signed off, so it remains the evidence that the copy is complete. ## Check 3: Reconcile call by call Compare source and destination for every recording, not just totals. Track extracted, converted, encrypted, stored and verified separately, so a gap shows exactly where it happened. ## Check 4: Prove every file plays A file that exists is not a file that plays. Decode each migrated recording, check its duration against the source and flag any that fail for a second attempt. ## Check 5: Keep the context and the holds Carry over the metadata that makes a call findable and defensible: date, agent, extension, direction, customer number, and any legal hold or retention rule. Encrypt each recording on arrival and keep its key separate from the media. ## Check 6: Sign off with evidence Close with a source-versus-destination study, an itemised list of exceptions and how each was resolved, and a decommission checklist the auditor can sign. Only then switch off the old recorder. ## After the migration The archive still has to serve its purpose until retention ends. Investigators and quality teams need fast search, replay with agent and customer on separate channels, and an audit of every search, play and export. Retention and legal hold must keep working, and recordings must be deleted on time. ## How CoreCx does it iFlux Secure Search & Replay reads legacy recorders in read-only mode, reconciles every call with six counters, encrypts each recording on arrival through CoreSec KMS, and produces a signed source-versus-destination study and a decommission checklist. The migrated archive is then served from a secure replay portal for as long as your retention requires. **Key takeaways** - A migration is only finished when you can prove every call arrived, not when the copy job ends. - Read the old recorder in read-only mode, so the source stays as evidence until sign-off. - Reconcile call by call, and itemise every exception instead of averaging it away. - Keep the archive searchable and replayable for the rest of its retention period. **The products behind it**[**iFlux Secure Search & Replay**Retire the legacy recorder. Keep every recording.](https://www.corecx.ai/products/iflux-secure-search-and-replay/)[**CoreSec KMS**Post-quantum key management that keeps your recordings yours.](https://www.corecx.ai/products/coresec-kms/)[**iFlux Recorder**Multivendor call recording, compliance-grade and sealed the moment every call is written.](https://www.corecx.ai/products/iflux-recorder/) ## Frequently asked questions about this playbook How do you migrate call recordings without losing any? Inventory the source first, read it in read-only mode, reconcile source and destination call by call, decode every migrated file, carry over metadata and legal holds, and sign off with a source-versus-destination study before switching the old recorder off. Do we have to keep the old call recorder running after migration? No. Once the migration is reconciled and signed off, the archive is searched and replayed from the new platform for the rest of its retention period, and the legacy recorder can be decommissioned. What happens to legal holds during a recording migration? They must move with the recordings. Each held recording keeps its hold in the new archive, so it cannot be purged until the case is closed. ## More insights [All insights](https://www.corecx.ai/insights/) [ Guide ### Why seven-year recordings need post-quantum keys 6 min readRead ](https://www.corecx.ai/insights/post-quantum-keys-for-seven-year-call-recordings/)[ Briefing ### Regulated contact centres, 2026 7 min readRead ](https://www.corecx.ai/insights/regulated-contact-centres-2026/) ## Talk it through with a specialist Bring your phone system, your retention rules and your regulator. We will map every line to a product and a setting. Contact us ## Talk to the right team. Call us, email us, or choose a form. A CoreCx specialist replies within one business day. [**Sales** Pricing, licensing, proposals and a demo on your own phone system. 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