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VoIP service needs a protocol to signal the calls. The signalling protocol used by IPBrick is SIP, but there are others such as H.323, MGCP, Jingle, IAX, H.248/MEGACO etc. SIP4.19 allows calls and conferences through IP, and those calls may include audio, video, images, etc. This way, the SIP protocol is responsible for all the processed calls between users, regardless the content of the call itself. The IPBrick.GT acts as an authentic PBX IP and it can route the calls to/from a traditional PBX, Internet, LAN and PSTN. All the PBX management is made by a software called Asterisk. Asterisk is compatible with several signalling protocols, including SIP. The routing work is made by another software that is acting as SIP proxy - OpenSER.
The VoIP features accessible through the web interface are presented next.