## The symptom

Sending a bulk SMS to 1000 phone numbers through the Plivo Node SDK times out:

```
Error: timeout of 5000ms exceeded
```

from axios, even though the same rate worked before. The failures started
appearing at larger destination counts.

## Why

The SDK imposed a fixed 5s timeout on the mass-text request, which is too short
for a large destination list. The bigger the list, the longer the request takes,
so it only breaks at scale.

## The fix

Upgrade to plivo-node 4.25.1 or later. Plivo removed the fixed timeout for
messaging requests in that release.

## Interim workaround on older versions

Split the bulk send into smaller destination groups (about 500 numbers each),
or raise the axios timeout on the client. Prefer the upgrade.