---
title: "Twilio Sync"
description: "1 posts about Twilio Sync, summarised, each linking to the original."
---

# Twilio Sync
> 1 posts about Twilio Sync, summarised, each linking to the original.

## Articles

### [On-Demand Masked Sessions with Twilio Proxy, Voice and Serverless](https://yomu.fyi/post/on-demand-masked-sessions-with-twilio-proxy-voice-and-serverless.md)
- Company: [Twilio](https://yomu.fyi/company/twilio.md)
- Author: Leroy Chan
- Published: Sep 16, 2026
- Type: Tutorial

This tutorial presents a Just-in-Time (JIT) masked session workflow for securely connecting callers when phone numbers cannot be pre-associated because of inventory constraints. The design routes an inbound call to a reserved Twilio number through Twilio Voice, uses an IVR to collect a six-digit tracking code, and dynamically creates a private Twilio Proxy session. It uses five serverless endpoints plus helper functions; because the Out-of-Session Callback lacks keypad digits, a “2-Bounce” flow uses a redirect and a temporary Twilio Sync Document keyed by res- plus CallSid to carry the resolved destination, with a short TTL such as 900 seconds. On the second bounce, the destination is retrieved and deleted, and Proxy receives instructions to auto-create the session and bridge the caller. The result is an on-demand masked connection across standard cellular connections that avoids static phone-number preallocation and preserves the number pool.