## TL;DR

Set a callbackUrl on your Dial XML and capture DialALegUUID and DialBLegUUID from the callback parameters. The workaround is to set a callback URL in the Dial XML and read DialALegUUID and DialBLegUUID from the callback request parameters documented under the Dial element.

## Steps

1. Do not hunt the Plivo web SDK for a call UUID; it is not exposed there. Set a callbackUrl on your Dial XML and capture DialALegUUID and DialBLegUUID from the callback parameters. If your call-tracking code reads undefined off the web SDK object, this is the boundary you are hitting, not a bug in your wiring.

## When to use

You are seeing this: Do not hunt the Plivo web SDK for a call UUID; it is not exposed there. Use this skill when you run into "Plivo web SDK has no call UUID: read it from the Dial callback".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.