To Buy a VoIP or an Analog PBX?

To stay with your trusty TDM based PBX telephone system or toss everything out in favor of a Voip phone system?

Why to reject services which would promise to enhance the productivity?
Substitute it all for a brand new Voice over IP phone system and take all the benefits this new technology offers.

How to proceed?

You can decide whether to have:
- analog,
- digital, or
- IP phones
each desk and if to go with VoIP phone services or TDM to connect with the outside world. Some systems will still permit to mix and match.

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

Most any phone system that handles more than a few phone handsets gives you the option on how to connect phones to the PSTN (Public Switched Telephone Network).

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

Usually you can mix and match purely digital and TDM phone systems, purely analog phone systems and purely VoIP phone systems. A Voip system may well have FXS (Foreign Exchange Subscriber or Station) ports to connect to analog handsets, as do traditional PBX phone systems. The phone service connection can be ISDN, T1, analog or SIP Trunking.

Usually modern Voip PBX phone systems offer a broader range of handset and phone service connection options than legacy PBX systems. But before you plan to replace your phone system, you may consult a skilled expert or search for relevant information in one of the many Voip Review Sites you’ll find online.

Jim Francisto
VoIP
Voip Blog
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