Illustration:

◆Intranet free communication: IP phone of headquarters in New York, FXO gateway, Sydney office’ s IP phone and Germany’s IP phone can be registered to IP PBX in headquarters.(IP PBX support dynamic IP address, can configure dynamix domain name). Traditional PBX in headquarter and Sydney can also be registered to headquarter ‘s IP PBX via 4-8 FXS and FXO port gateway. Through management of headquarter’s IP PBX, you can enjoy the free communication between all branches’ IP phone and traditional PBX’s normal telephone. Intranet free communication is realized!

◆Call from outside: Other network telephones or the web phones belong to the same VOIP operator can dial New York headquarter IP-PBX via VOIP operator (The inner net number divided to the IP-PBX by the VOIP operator). After hearing the voice of “hello, this is ⅹⅹcompany, please dial the extension number”, please dial the extension Web Phone affiliated to IPPBX of Sydney, Germany and New York the second time. The local general telephone user of Sydney, Germany, New York.(PSTN in the picture) dial the local number to connect to New York’s and Sydney’s PBX. When you hear the prompt on traditional PBX, ”Hello, this is  ⅹⅹcompany, please dial the extension number”, then dial the traditional extension number. With combined use of FXS and FXO port gateway, call can be connected to IP PBX also; The local general telephone user of Sydney, Germany, New York dial the local number (Through the FXO gateway of the companies in different places t connect into the local PSTN) can connect with the IP-PBX in New York directly through the internet then go into the headquarter ‘s IP-PBX in New York. After hearing the voice of “hello, this is ⅹⅹcompany, please dial the extension number” then for the second time to dial the each extension number  affiliated to the IPPBX of Germany, New York. With the combination use of FXS/FXO port gateway, call can be connected to traditional extension number.

◆Intranet call out: All the extensions that belong to IP-PBX can through the upper-- level operator of the IP-PBX to dial the common telephone all around. Extension in New York and Germany can dial from company’s FXO port gateway and dial local call. Branches’ IP entension number in New York, Sydney, and Germany can dial via internet from New York and Germany’s FXO port. When the call is put through, local call is connected and long distance call path is avoided. Thus, long distance call is changed to local call.