What Is Calling Line Identity (CLI or CLID)?

Person holding a phone with the letters CLI

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These days, the telephone number of the caller travels ahead of most calls. This is known as Calling Line Identity (CLI) or by BT as Caller ID.

You will probably most often see this when someone calls your mobile phone. This is also known in the USA as Automatic Number Identification or ANI.

This number can be used by CTI software to match up to a computer record for that caller.

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Robyn Coppell

Robyn Coppell has worked as Digital Content Manager for Call Center Helper since 2021. After University her first job was in a contact centre and has stayed in this space ever since.

She has experience of contact centre operational management, software systems, css and php coding. She edits a lot of the guest content that is published on Call Centre Helper.

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What Is Calling Line Identity (CLI or CLID)?

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