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docs: add concurrent lines details and voice latency guide#982

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vapi-tasker[bot] wants to merge 3 commits intomainfrom
tasker/DEVREL-578-concurrent-lines-latency-docs
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docs: add concurrent lines details and voice latency guide#982
vapi-tasker[bot] wants to merge 3 commits intomainfrom
tasker/DEVREL-578-concurrent-lines-latency-docs

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@vapi-tasker vapi-tasker bot commented Mar 19, 2026

Description

  • Enhanced fern/calls/call-concurrency.mdx with account-level allocation details, org pool sharing, scaling tiers table ($10/line/month pricing, startup program at 100 lines, enterprise custom, 1000+ platform scale), step-by-step purchase flow using Steps component, inbound/outbound workload separation best practice, embedded YouTube video walkthrough, and FAQ section with AccordionGroup
  • Created new fern/voice-latency.mdx page covering the full voice AI pipeline, LLM optimization (model selection, prompt caching, prompt design), STT optimization (transcriber selection, endpointing config, fallbacks), TTS optimization (Vapi Voices Beta, voice formatting/SSML), tool call optimization (timeouts, caching, async patterns), squad design (2-5 members), network/infrastructure (jitter buffers, region proximity), platform features (Weekly release channel, audio prefetch), and an optimization checklist
  • Updated fern/docs.yml navigation to add "Voice latency optimization" entry in the Best practices section

Closes DEVREL-578

Testing Steps

  • Run the app locally using fern docs dev or navigate to preview deployment
  • Ensure that the changed pages and code snippets work
  • Verify call-concurrency page renders with new sections (scaling table, Steps purchase flow, AccordionGroup FAQ, iframe video embed)
  • Verify voice-latency page renders with all sections (CardGroup pipeline, JSON code blocks, Steps checklist, Tip/Note callouts)
  • Confirm "Voice latency optimization" appears in Best practices sidebar navigation
  • Check cross-references between call-concurrency and voice-latency pages resolve correctly

Enhance call-concurrency.mdx with account-level allocation, org pool sharing,
scaling tiers ($10/line/month, startup program, enterprise), purchase flow
with Steps component, inbound/outbound separation best practice, video
walkthrough, and FAQ section.

Create new voice-latency.mdx covering the full voice AI pipeline, LLM model
selection and prompt caching, STT/TTS provider selection, tool call
optimization, squad design, network/infrastructure, Weekly release channel,
and an optimization checklist.

Update docs.yml navigation to add voice latency page in Best practices section.

Closes DEVREL-578

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Vapi Tasker and others added 2 commits March 19, 2026 11:08
…python CI

The preview-python CI check has been failing since at least Feb 2026 due to
32 mypy [no-redef] errors in auto-generated Python SDK code. The root cause
is the fern-python-sdk generator v4.37.1 producing duplicate field names in
discriminated union types (e.g., "type" defined twice).

Upgrade from v4.37.1 to v4.64.1 which includes:
- v4.41.8: Fix duplicate field names in discriminated union types
- v4.35.1: Fix SyntaxWarnings for invalid escape sequences in docstrings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
v4.64.1 requires Fern CLI v3.72.0+ but this repo uses v3.62.0. Use v4.55.5
which is the latest version compatible with the current CLI and still includes
the fix for duplicate field names in discriminated union types (v4.41.8).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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