What network facilities do I need to provide?

This may vary widely depending on how your network is deployed and what else it is carrying, but as a general guide you will probably need:

• A SIP proxy server (to route calls)
• A SIP registrar server (frequently combined with proxy servers)
• A TFTP server (for downloading configuration files)
• A TCP Syslog server (for reporting alarms and external inputs)
• An SMTP server (for reporting via email)
• An STNP server (to synchronise the internal clock)
• A STUN server (for NAT firewall traversal)

Dedicated systems, such as Gatekeepers, VoIP-enabled PABXs or soft PABXs may also provide these functions.  Bear in mind that GAI-Tronics telephones only support Session Initiation Protocol (SIP) to RFC3261, as opposed to H.323 or SCCP VoIP protocols for example.

Note that the performance of VoIP telephones depends on the provision of sufficient bandwidth and prioritisation on the network to give the quality of service required.