---
title: c-TelephoneNumber
description: Phone number for a collection of entries.
component: pingds
version: 8.1
page_id: pingds:schemaref:at-c-TelephoneNumber
canonical_url: https://docs.pingidentity.com/pingds/8.1/schemaref/at-c-TelephoneNumber.html
---

# c-TelephoneNumber

Phone number for a collection of entries.

|                             |                                                                          |
| --------------------------- | ------------------------------------------------------------------------ |
| *OID*                       | 2.5.4.20.1                                                               |
| *Names*                     | c-TelephoneNumber                                                        |
| *Superior type*             | [telephoneNumber](at-telephoneNumber.html)                               |
| *Syntax*                    | [TelephoneNumber](s-TelephoneNumber.html)                                |
| *Equality matching rule*    | [telephoneNumberMatch](mr-telephoneNumberMatch.html)                     |
| *Substring matching rule*   | [telephoneNumberSubstringsMatch](mr-telephoneNumberSubstringsMatch.html) |
| *Single value*              | false: multiple values allowed                                           |
| *Collective*                | true                                                                     |
| *User modification allowed* | true                                                                     |
| *Usage*                     | userApplications                                                         |
| *Origin*                    | [RFC 3671](https://datatracker.ietf.org/doc/html/rfc3671)                |
| *Schema file*               | 00-core.ldif                                                             |