## 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.