In Appendix section you can find additional useful documents and information related to Ozeki Phone System VoIP PBX software and VoIP technology.

Appendix A - Error codes

Appendix B - CAPI devices

Appendix C - SMS service providers

Appendix D - RFC document list

Appendix E - ATA devices

Appendix F - FAQ

Appendix G - SIP Protocol responses

Next page: Appendix A - Error codes