Best VOIP Phone Systems

Like any other ordinary telephone, the voip phone systems are built with protocols that enable it to transport voice using data packets instead of circuit-switched connections over voice-only networks. This line is plugged into the Ethernet port or the USB port of the computer.
With laptops and other WiMAX and WiFi application gaining ground wireless internet phone is also being offered. The voip phone uses Session Initiation Protocol (SIP) or Media Gateway Control Protocol (MeGaCo) to establish a call. Modern IP phones have an ever growing list of features like third party call control, open codecs, IPv6 support and NAT traversal so it can be used in LAN’s and WAN’s. You can unplug the IP phone and carry it anywhere with you and still listen to voice mail and make calls with the same telephone number.

Internet Telephone Features

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Provides dual/multiple port 10/100 switched Ethernet for connectivity between the phone and a PC
Supports IEEE 802.3af Power over Ethernet
Uses switches for Network Connectivity; 10/100 switched Ethernet
The support offered by the codecs is G.711, ADPCM, G.729a/b etc.
Provides adaptive Jitter Buffer
Supports DHCP option 184
Uses RTP
Also suppresses silence separation for bandwidth conservation G.729b codec.
The other features that are available are caller ID, call waiting, call forwarding, three-way calling, voice mail, reminder calls, priority call, call rejection, call barring, withhold number, call trace

Soft Phones

Software-based phone for voice over IP is installed on the user PC. If you want better quality get a phone with blue tooth connectivity or a phone that connects to the USB port. Soft phones can work alone or be a part of an IP PBX. This phone is just turning a desktop PC into an IP based phone. It is easy to install and consist of a microphone, speaker and sound card (in built in most systems). Its advantage is that it integrates with popular applications like Microsoft Outlook and Lotus Notes. The disadvantage is that it does not have a good voice quality. It runs over the existing broadband internet and follow the specifications required by the network. In case of enterprises IP PBX becomes and essential part, which can be implemented, using software.

Soft Phone Features and Specifications

Tight integration with popular applications
many adjustable options for the screen and options to adapt the soft phones to achieve better services
Unified messaging; or an equivalent service.
Record additional greetings and ring tones and choose how calls should be answered.
Easy to use and customize
Ability to manage calls via a single voice mailbox
Services like call forwarding, automatic callback, call conferencing, instant messaging, directory support, call retrieval, call-duration (timer) feature
voice mail
intercom capabilities
instant messaging
the ability to create multiple user profiles
time-of-day routing (supported only by Cisco and Swyx)

Mobile VOIP Services

What is the need for a wireless internet phones and satellite internet phones? This is because mobile operators especially those who have the third generation of mobiles which are more like laptops based 3G/Wi-Fi service. VoIP is being offered to these customers providing voice and data under one service for both their handset and laptop. Microsoft, Nokia, and Skype have announced mobile phone-based VoIP products. These cell phone internet services will change the way cells are used. Already mobiles are being used for internet emails and picture messages. SMS and MMS may soon fade away giving rise to video phone calls or video chats.

VoIP systems are constantly evolving and there is a growing trend of convergence of all technologies over the internet. This is essentially due to the ubiquity of the net and its far reaching network.

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