> ## Documentation Index
> Fetch the complete documentation index at: https://help.optua.co.uk/llms.txt
> Use this file to discover all available pages before exploring further.

# DIY Call Tests

Optua operates multiple facilities on the provider-level to allow you to troubleshoot any faults before contacting Optua to see if it's our issue, or your issue.

**Echo Test**

In the echo test, everything you say will be repeated as soon as it is received. This allows you to estimate the latency of a call.

To use our echo test facility dial **555 555 555 2** from any registered Hosted VoIP device or registered SIP Trunk.

**Milliwat Test**

A Milliwatt test is a test method or test facility used in telecommunications to measure line quality and transmission loss between stations or points in an analog telephone system. You should hear a continuous, uninterrupted 1004Hz tone assuming you are not suffering from jitter or packet loss issues.

To make use of this test dial **555 555 555 1** from any registered device on hosted VoIP or registered SIP trunk.

**Invalid CLI emails**

If you make a call that doesn't meet our/our providers CLI specifications, you may receive an email detailing this. Please contact us if you have any issues with this.