To keep your conventional PBX system or throw it away in favor of a Voice over IP phone system?

Why to reject services which would increase the value of the productivity?
Replace it all for a brand new Voice over IP system and take all the benefits this relative new technology provides.

How to proceed?

You can decide whether to have:
- analog,
- digital, or
- IP phones
on your desk and whether to take TDM or VoIP telephone services to be linked with the outside. Some systems will even allow to mix and match.

Which one to take?
VoIP?
TDM?
or Both?
Why not?

Many phone system that handles more phone handsets gives you an option on how to connect phones to the PSTN or Public Switched Telephone Network.

A pure Voice over IP phone system operates totally in the IP world from handset to call termination. The PBX equivalent is the Voip PBX. The Voip PBX is mainly a software running on a Linux system. Handsets are referred to as SIP phones.
SIP (Session Initiation Protocol) is a switching protocol that controls the phone calls on packet based networks. Calls between subscribers to the same Voice over IP service provider never leave the network and never enter the PSTN or Public Switched Telephone Network. Calls from and to non-subscribers are terminated to the PSTN at the provider's location.

Most of the time, you can mix and match purely VoIP phone systems, purely analog phone systems, purely digital and TDM phone systems. A Voice over IP system may well have FXS ports to connect to analog handsets, as do traditional PBX phone systems. The phone service connection may be T1,  analog, ISDN, or SIP Trunking.

Most of the time, the newer Voip PBX phone systems offer a broader range of handset and phone service connection options than legacy PBX systems. But before you make any big purchases or plans to scrap  you current phone system, you should consult  a skilled expert or get related information in one of the many Voip Review Sites you'll find online.

Jim Francisto
voip-voice-over-ip.com