A VoIP PBX is different than a traditional PBX in the sense that your telephone calls are transmitted via your IP network, hence the name IP PBX (or VoIP PBX). An IP PBX doesn’t mean you have to give up your existing analog lines either; there is a difference between doing VoIP on the WAN and VoIP on the LAN.
A lot of customers using an IP PBX continue to use their existing analog phone lines and integrate them into their LAN through the use of a VoIP gateway or a PCI card.
The two primary reasons to switch to a VoIP PBX are cost and flexibility.
Here are some reasons why you would want to switch to a VoIP PBX system:
Additionally, most IP Phones have two 10/100 auto-sensing RJ-45 ports. This allows you to connect your VoIP phone to your network, and connect your PC to your network via the phones internal switch. And in situations with only one network connection available you will want to use a managed switch to manage the data traffic and voice traffic.
Why is this listed as a cost savings? Most managed switches have optional PoE (power over Ethernet); allowing you to purchase just on UPS to backup all the phones on your network rather than putting an individual UPS at each work station.
VoIP PBX systems are extremely flexible because:
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I have found the main draw back to VoIP's can be that if you have low bandwidth internet in your office, which is shared between your computers for internet and the VoIP, you will sometimes lose calls if people are streaming music or videos. Otherwise, they're great!
I agree with the above, You really have to do your homework when it comes to voip and bandwidth management. QoS is a must or data will eat up all of your voice
Cost is definitively the leading benefit for voip. For only 20 bucks or less you can have a hosted voip solution with none of the hassle of telco