Voip Phone Systems

Either internet phone can be a soft phone, which converts the desktop PC into a phone, or it could be a standalone phone system. There are basically three options you could choose from depending on your requirements.

You can still use your old analog telephone as an internet phone. All you need to buy is a device called the analog telephone adaptor. Plug your old telephone to this or even the computer to this and you have a voip phone.
IP phones look a lot like analog telephones. They have the analog telephone adaptor built into the system and host a lot of other features too. They connect to the internet via the Ethernet connector.
PC to PC is the best way to use VoIP and in this method you may download free software or buy software. All you require is a microphone, speakers, a sound card(inbuilt in modern system) and a high speed internet connection like DSL or cable modem.

Analog Telephone Adaptor

The ATA-analog Telephone adaptor is used to connect the traditional telephone to a computer or network so that the old phone can still be used to make calls over the internet. This is because internet based long distance calls are cheaper. An ATA is definitely cheaper than a VoIP phone. The ATA does the analog to digital conversion and connects directly to the VoIP server.

The ATA can connect even fax machines to the internet. Some of the ATA’s provide two ports to maintain your old PSTN network incase of power shut down. This helps you make the transition to Voice over IP easier. The other connection is usually an Ethernet adaptor to be connected to a broadband device (ADSL modem, cable modem etc.) The simplest ATA can have one or more RJ-11. Registered Jack-11 is a telephone connector with four or six wires used for connecting the telephone.

The ATA can have an embedded hardware with software for digitalizing the voice to transmit over the internet or it can be plugged into the USB port of a computer, which does the conversion and the transmission. For large enterprises ATA’s with multiple telephone Jacks, a Ethernet hub or switch is needed to connect to the LAN. ATA needs H.323 or SIP to communicate to the VoIP server. This is also known as a VoIP gateway. The features and specifications are given below.

ATA Features and Specifications

Interfaces old telephone devices to IP-based networks
Requires one or more RJ-11 telephone ports
Optional PSTN backup line
For enterprises RJ-45 connection to 10Base-T Ethernet hub/switch
Configuration is web based
Offers good performance with line echo cancellation that eliminates noise and feedback
Adaptive jitter buffer
Supports standard VoIP protocols
Supports G.711, G.723.1, G.726, G.729A/B,iLBC and other vocoders
Line: SLIC multi-line impedance adaptation; CLI/CW (DTMF/FSK/Polarity Reversal);Tone control; Adaptive jitter buffer
Class Features: Call Waiting/Return/Forward/Call Transfer/call conferencing
Echo Canceller: G.168 up to 32 ms
Multiple ringing tones; Message waiting (Tone/Ring/Visual)
Fax: Detection, Fallback, T.38 real-time Internet fax
NAT Traversal: NAT, STUN
Configuration using Multi-level password control, User interface; HTTP configuration; TFTP (configuration & firmware)
Debug Features: RTP & IP stats; Trace SIP output; Internal loop back feature

Continue to : True IP Based VoIP Phone Systems

Quality Assurance: Voice Quality Tests
Outsourcing: Call Centers And VOIP
VOIP’s Next Generation Users: Residential VOIP’s
Don’t Share Files But Speak Views: VOIP Conferencing

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ATA Features and Specifications

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