Ip pbx

A VoIP Phone System / IP PBX system consists of one or more SIP phones / VoIP phones, an IP PBX server and optionally includes a VoIP Gateway. The IP PBX server is similar to a proxy server: SIP clients, being either soft phones or hardware based phones, register with the IP PBX server, and when they wish to make a call they ask the IP PBX to establish the connection. The IP PBX has a directory of all phones/users and their corresponding SIP address and thus is able to connect an internal call or route an external call via either a VoIP gateway or a VoIP service provider to the desired destination.

At the center we have, the IP PBX. Starting from the bottom, we see the Corporate Network. This is the company’s local network. Through that network, Computers running SIP clients such as the 3CX softphones, and IP Phones connect directly to the PBX. On the left, we see the company’s router/firewall connected to the internet. From there it can connect to remote extensions in the form of computers running the softphones, remote IP Phones, mobile devices running the 3CX Android and iOS clients, and Bridged PBX’s. Using a VoIP provider we can connect to the PSTN network. To the right a VoIP Gateway connects the PBX directly to the PSTN network.

Advantage of IP-PBX System

Ten advantages of an on premise IP-PBX are:

• It uses your LAN- An IP-PBX business phone system will reside on your network using your existing LAN. The PBX server is only a short distance away, so signaling distance and time (latency) is very short and does not depend on traveling over the Internet and other networks.
• Lower operational costs over time- In addition to taking advantage of lower cost VoIP routing, purchasing your own IP-PBX lowers costs over time.  When using hosted VoIP the initial costs are most likely lower, but monthly subscription costs are ongoing and higher over time when compared to an IP-PBX.   An business owned IP-PBX will usually result in lower averaged monthly operating costs especially for systems with a higher number of users.
• Easier to configure and install than proprietary phone systems- Proprietary phone systems can be cumbersome and difficult to navigate around their software to configure and install.  An IP-PBX system will be much more familiar to computer savvy people, especially someone who has experience with  networks.  This can be especially true for Asterisk based systems that have a front-end GUI such as FreePBX.
• Simpler Management- The GUI of an IP-PBX will be much more user friendly than traditional PBXs.  This allows for easier changes and additions.
• Easy to move phones- Because phones are IP based, they are like PCs, move them from one connection to another and they find home and connect right back up to the PBX server.  No longer are the days when a simple phone move needs to have cross connects changed and a phone technician making a billable service call.
• Unified Messaging- Having the ability of receiving and listening to your your messages from your Outlook inbox, along with PDFs of faxes increases communication and productivity.  Integration with work applications, such a CRM packages can help business perfrormance.
• Branch offices- can be added to an existing system and connected through an Internet connection.  (Again lower cost, with the IP-phones being the major cost of the hardware needed.)
• Remote Extensions- employees can plug in a compatible IP- Phone at home to their Internet connection and be extension dialing. 
• Cost savings by connecting to VoIP providers via SIP trunking- Using SIP trunking with an in house IP-PBX can connect to lower cost VoIP providers; reducing phone bills, especially long distance and International calls.
• More choices- Major companies that have built PBXs are now focused on IP connectivity, but even better are all the upstart companies that are building Asterisk IP-PBXs with lower prices and vendor neutral hardware.

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