# Manage phone numbers

- [How do I book phone numbers?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-buche-ich-rufnummern.md): Instructions for booking German local, mobile, and international phone numbers with sipgate, including test numbers and verification.
- [How do I assign the phone numbers?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-weise-ich-die-rufnummern-zu.md): Learn how to assign, change, or remove phone numbers in sipgate to users, groups, or VoIP lines.
- [How do I assign an extension?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-weise-ich-eine-durchwahl-zu.md): This is how you assign internal extensions to users and groups in sipgate for speed dial, presence display, and busy lamp field.
- [How can I extend a local phone number?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-kann-ich-eine-ortsrufnummer-verlaengern.md): Learn how to extend a German local phone number by one digit in sipgate as an admin and thus expand your existing number range.
- [How can I cancel a phone number?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-kann-ich-eine-rufnummer-kuendigen.md): Step-by-step instructions for canceling phone numbers in the sipgate account management, including the option to revoke.
- [How can I port my phone numbers to other providers?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-kann-ich-meine-rufnummern-zu-anderen-anbietern-mitnehmen.md): This is how you port landline and mobile numbers from sipgate to another provider – free of charge and uncomplicated.
- [How do I enter the phone numbers in the Telekom phone book?](https://help.sipgate.de/cloud-telefonanlage/en/account-management/rufnummern-verwalten/wie-trage-ich-die-rufnummern-ins-telefonbuch-der-telekom-ein.md): Instructions for entering your sipgate phone and fax numbers in Telekom's public phone book via location management.


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