Best Voip Equipment for Network

Add on cards are required for network access and some of the add on card are now VoIP compliant giving it access to PSTN-Public Switched Telephone Networks as well as to the LAN or internet.

These cards are expandable in the number of ports they can use and can be used as an IP PBX.

VoIP PBX-Private Branch Exchange

A VoIP phone converts the voice into digital data. Then it is sent along the IP network to the VoIP PBX phone system. This system put the packets in order, decompresses them and converts it back to the analog sound signal that can be received by any existing telephone equipment. This PBX can be implemented on standalone PBX exchanges which are provided by companies or it can be implemented on software which does all the functions done by the hardware. Microsoft’s RTC server support IP PBX.

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VoIP Router

This is for businesses or homes that want to take advantage of Internet connectivity and Voice Over IP using a single gateway. This connects to the cable/DSL modem and regular phone as well. More computers can be added to share this resource. It supports DSL accounts and internet firewall as well. Many VoIP providers offer routers along with their service. In most cases these routers will not work with other service providers.

VoIP Gateways

A network device that converts voice, in real time, between the public switched telephone network (PSTN) and an IP network is a VoIP Gateway. Its other functions include Voice and fax, compression/decompression, packetisation etc. Gateways are thus interfaces between legacy PSTN and IP PBX systems.

VoIP Switches

These are device to allow connection of multiple phone lines into one Ethernet port. This allows many people to use a single Internet connection for VoIP purpose.

Most of the hardware available in the market are manufactured with codec’s, compression and decompression methods that change with newer research. The protocols to implement VoIP also changes. This is problematic in many cases. Session initiated protocol proposed by IETF is a major change in VoIP and many systems have incorporated SIP and market their phones as SIP IP phones or equipment.

Specifications for VoIP Telephony

Voice algorithms: G.723.1a, G.729ab, G.711
Fax support: Industry standard T.38 and Group III at 2.4, 4.8, 7.2, 9.6, 14.4 Kbps
Standard 50 pin RJ-21 Telco connectors
Coding: A-law, µ-law
Enhanced (Carrier Grade) Echo Cancellation: ITU Rec.G168, up to 128 msec
Tandem/TDM switching

The equipment both software and hardware is gearing to a growing and evolving industry. If you are renting equipment with a VoIP service provider then it is possible to ask for enhancements. Even with software the algorithms for codec’s and compression and decompression is reflected in the newer versions. Protocol changes are also reflected as witnessed with SIP on Windows XP.

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