> For the complete documentation index, see [llms.txt](https://support.portsip.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.portsip.com/development-portsip/rest-apis/version-22.0/api-reference/user/business-contacts.md).

# Business contacts

- [Favorite](https://support.portsip.com/development-portsip/rest-apis/version-22.0/api-reference/user/business-contacts/favorite.md)
- [Unfavorite](https://support.portsip.com/development-portsip/rest-apis/version-22.0/api-reference/user/business-contacts/unfavorite.md)
- [Sync tokens](https://support.portsip.com/development-portsip/rest-apis/version-22.0/api-reference/user/business-contacts/sync-tokens.md)
- [Diff](https://support.portsip.com/development-portsip/rest-apis/version-22.0/api-reference/user/business-contacts/sync-tokens/diff.md)