Deep Dive into Call Directory Extension
summary
A company built an in‑app spam filter that writes 300k–400k phone numbers to iOS Call Directory Extension and has run it in production for about five years. The talk covers practical problems: slow import speed varying by device (older phones take tens of seconds), fragile diff-based updates that require careful delete/insert logic, memory limits and crashes on large imports, and iOS 13.x issues with certain numbers (emergency/prefix handling).
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chapters (9)
- 0:00Introduction
- 1:18Call Directory Extension details
- 2:24Key features and examples
- 4:14Internal spam call system
- 6:53Implementation notes and history
- 8:43iOS version differences
- 12:51Constraints and issues
- 14:59Common field problems
- 16:45Future outlook and summary
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