- Wikipedia: Brekeke PBX
- Quintum Technologies, LLC.: Partner - IP PBXs and Enterprise Applications
- Snom Technology AG: Interoperability - SIP IP PBX
- Voip-info.org: Brekeke PBX Brekeke PBX Multi-Tenant Edition
- SIP center: http://www.sipcenter.com/sip.nsf/html/IP+PBX
- SIP Forum: http://www.sipforum.org/content/view/140/193/
