sip:sip_pbx [IG Manual]

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====== SIP PBX ======
SIP PBX requires firmware release 5.33 or later installed in the unit.\\ 
SIP PBX requires purchase of [[license:]] to be activated.\\
SIP PBX requires a USB memory stick to be inserted into the unit's USB port for optimal functionality.

===== SIP Switch =====
The [[SIP switch]] is the main component of the Internet Gate's SIP PBX feature. The SIP switch routes incoming and outgoing calls depending on who called whom and at what time of the day, what extension numbers were called, authentications, blacklists, etc.

===== SIP Server =====
The built-in [[sip:set_up_a_sip_server|SIP server]] allows you to launch a full SIP domain without the need to buy services from a provider.

===== SIP Trunks =====
[[sip:trunk]] SIP trunks are used to connect to Internet Telephony Service Providers (ITSP) using SIP over Internet.

===== Phone ports =====
The [[sip:telephony_ports|Telephony ports]] of the Internet Gate provide one generic FXO port that can be configured to allow all users access to the old-style PSTN global telephone network, and FXS ports for connecting analog telephones and fax devices.

===== Voicemail =====
Using [[sip:voicemail]] callers can leave messages to users not answering their calls.

===== Auto attendant =====
The [[sip:Auto attendant]] can answer incoming calls and allow callers make choices using their phones' keypads.