Sara Paxton Emergency Alert System

Amplified Caller

Voice Quality in VoIP

Factors governing voice quality in VoIP

Available Bandwidth at caller side – If the caller has poor internet bandwidth then it might affect the voice packets to traverse correctly and essentially affect the voice quality.

Available bandwidth at carrier side – Call termination also requires adequate internet bandwidth for each call or else it might result in packets loss and other known issues.

Codecs – The choice of a codec determine as to what is the amount of internet bandwidth that each call will consume. So, for example, if the available internet bandwidth per call is 35 kbps then using G.711 codec would be inefficient choice, as G.711 requires 64 kbps internet bandwidth per call. Whereas, G.723 or G.729 would be good choice.

Packets Loss – In VoIP, there are 2 parts in which a conversation can be broken:

* Signaling

* RTP Packets (also know as Media)

When the caller or callee speaks then the voice travels, from one end to the other through internet, in the form of voice packets. These packets are essentially traversed like data on the internet and each packet is sent in a sequential form. All the voice conversations, in VoIP, happen largely over public internet, hence, it is difficult to control the delivery of voice packets from one end to the other. This results in loss of packets or delay in packets delivery and hence ultimately resulting in voice delay (receiver hear the voice with identifiable delay), loss of voice (receiver is unable to hear something).

* Poor Jitter/Buffer Handling - In order to provide smooth RTP packet flow, Voip Clients (Sometimes server too) manage jitter buffer, in other words client collect packets for a time period, before relaying it. This causes delay in voice but considerably smooth voice flow. Poor jitter-buffer management may result to very long delays.

* Echo – Echo is the phenomenon in which the call receiver or the caller hears own voice being repeated. This occurs because of either faulty microphone and speakers and is enhanced by Amplifiers used in Internet.

* Noise – Poor bandwidth connections, bad quality network wires, transmission leakages collectively result in external noises to be heard along with the primary conversation. The caller and call receiver hear this as noise occurring and thus hampering the conversation quality badly.

Why is good voice quality a challenge in VoIP?

* Public Internet for voice traversal

* VoIP being a Distributed & differentiated network

* Lack of affordable & competent solution with capability to handle media effectively

What is the importance of Voice Quality in VoIP?

* Today, in global environment, each service provider has access to all the big carriers directly and this means that low rates is not a competitive edge any longer because there is always a lower rate, than what you may offer, available in the market.

* Softswitches plus billing software are also available at very competitive pricing and in very easy to install manner. That means that every one can afford, nearly, similar set of software setup (atleast to support some limited volume of traffic)

That makes Good Voice Quality as the single most important factor that can be a make or break difference between various competitors in the market.

Notably, the core function of a tele-conversation is always the voice quality. If there's a problem in this core function then no matter how many add-ons (like low rates, better look & feel) are provided, the service would never succeed.

Possible Solutions to overcome Poor Voice Quality

* Better internet bandwidth connectivity throughout the globe – This is more like a wish than a reality. It would take a lot of years, still, to get the internet bandwidth upgraded.

* One Single unified end-to-end bandwidth channel for all voice conversations on IP (similar to PSTN telephones) – This defeats the benefits that VoIP brings along. The biggest factor contributing to VoIP's rise is the fact that it utilizes the existing internet connectivity prevailing around the world. If one has to setup the point-to-point channels, then it would bring us to back where we were. This is more of a hypothetical situation that a reality.

* Affordable Innovation, at software level, tacking the reasons that result in poor voice quality – An ideal solution, to this present problem, is in the form of a software or set of software that provides a solution to the problems like Packets Delay, Packets Loss, Echo, Noise, Jitter/Buffer etc. Such a software would be effective because it takes care of the root causes and deals with them at software level thus resulting in a stable, echo free, noise free voice conversation through IP.

* What is also important is to make such software really affordable so that it's true power can be realized by all the service providers and the real benefits pass on to the end callers. This would thus culminate in to harnessing the true power of VoIP!

About the Author

Media team|

Geemarc Amplified Talking Caller ID Phone AMPLIVOICE50 $72.92 Geemarc Amplified Talking Caller ID Phone AMPLIVOICE50

Amplified Cordless Telephone With Caller ID $56.01 - Clarity 900MHz amplified cordless telephone- Caller ID, call waiting caller ID- 3-Line LCD on handset- Boost button- Incoming sound 30dB amplification- Large, lighted dial keypad- Clarity Power Technology (amplifies and shapes high frequency sound)- Cus

Clarity / 2.4GHz Amplified w/ Caller ID 50dB White / C4210 $117.88 Clarity - 2.4GHz Amplified w/ Caller ID 50dB White - C4210

Clearsounds Amplified Speakerphone w/Caller ID Large LCD White CLSCST25 $45.4 Clearsounds Amplified Speakerphone w/Caller ID Large LCD White CLSCST25

Fanstel 50dB Amplified Corded Speakerphone Caller ID White ST50 $91.89 Fanstel 50dB Amplified Corded Speakerphone Caller ID White ST50

Serene Dect 6.0 Amplified Talking Caller ID Cordless Phone SICL60 $122.62 Serene Dect 6.0 Amplified Talking Caller ID Cordless Phone SICL60

Clarity 900MHz Amplified Cordless Telephone Caller ID White C420 $62.16 Clarity 900MHz Amplified Cordless Telephone Caller ID White C420

Clarity Amplified Cordless Telephone with Caller ID. Each $56.54 Manufacturer: Clarity. Each. Clarity 900MHz amplified cordless telephone Caller ID, call waiting caller ID 3-Line LCD on handset Boost button Incoming sound 30dB amplification Large, lighted dial keypad Clarity Power Technology (amplifies and shapes high

Clarity 2.4 GHz Amplified w/ Caller ID. Each $112.54 Manufacturer: Clarity. Each. 2.4GHz Amplified w/ Caller ID Clarity 2.4GHz amplified cordless telephone Amplifies incoming sound up to 50dB 3 Tone settings Caller ID, call waiting caller ID 50# Caller ID memory Hearing aid compatible Mute/flash/redial/paus

ITT Amplified Big Button Telephone with Caller ID. Each $71.14 Manufacturer: ITT. Each. Cortelco amplified big button corded telephone Caller ID, call waiting caller ID 3# One touch emergency buttons 100# Phonebook (32 digits and 15 letters for name) Phone record (last 50 answered, last 50 missed calls, and last 10 d

Sonic Alert Geemarc Ampli500 50db Amplified Telephone with Caller ID. Each $101.74 Manufacturer: Sonic Alert. Each. Caller ID and Amplified Speakerphone The Ampli500 is the perfect blend of features for a remarkable price. It boasts up to 50dB amplification, Caller ID with large LCD display, an optional bed shaker ring signaler (sold se

Amplified $6.49 Amplified

Itt Cortelco Amplified Big BTN Corded Telephone Caller ID Speakerphone Frost 2420 $72.87 Itt Cortelco Amplified Big BTN Corded Telephone Caller ID Speakerphone Frost 2420

Sonic Bomb Geemarc Amplified Big BTN Telephone With Answering Machine Talking Keys and Caller ID GMAMPLI455 $106.36 Sonic Bomb Geemarc Amplified Big BTN Telephone With Answering Machine Talking Keys and Caller ID GMAMPLI455

Clarity 2.4GHz Amplified Cordless Telephone w/ Caller ID 50dB White C4210 $86.98 Clarity 2.4GHz Amplified Cordless Telephone w/ Caller ID 50dB White C4210

Clarity Professional 5.8GHz Cordless Expandable Amplified Phone Caller ID Speaker C4220 $131 Clarity Professional 5.8GHz Cordless Expandable Amplified Phone Caller ID Speaker C4220

GE Thompson Dect 6.0 Amplified Expandable Cordless Phone Digital Answering Caller ID Silver 29115AE1 $53.29 GE Thompson Dect 6.0 Amplified Expandable Cordless Phone Digital Answering Caller ID Silver 29115AE1

The Caller $10.99 The Caller

GE/RCA 11241WTGA-R Amplified Big Button Corded Caller ID Phone $49.99 "RCA 11241WTGA The RCA 11241WTGA amplified big button corded caller ID phone is perfect for meetings and conference calls. It has amplified volume up to 40 dB and amplified ringer up to 90 dB. This phone features pitch tone control, speakerphone, redial and flash function along with 3 one-touch emergency dial. The 11241WTGA can be easyly mounted on a desk or a wall. Caller ID log, call waiting, enhanced visual ringer are some of the features that lets your talks go clean with it. It also features optional vibrating ringer, 3.5mm neck loop jack and 2.5mm alert jack with vibrating pad. 11241WTGA Features: Vibrating Alert 2.5mm Alert Jack for Included Vibrating Pad, Amplified Corded Phone, Caller ID / Call Waiting, Amplified Volume - Up To 40dB, Tone Control Lets You Customize The Amplifier For Optimum Clarity, Amplified Ringer - Up To 90dB, Wall Mountable/Mount Included, Speakerphone, Backlit LCD w/ Adjustable Tilt, Enhanced Visual Ringer, Vibrating Handset Ringer, 3 One-Touch Speed Dial Keys, Redial, Flash, 3.5mm Neckloop Jack"

GE/RCA 11241WTGA Amplified Big Button Corded Caller ID Phone $59.99 "RCA 11241WTGA Brand New Includes One Year Warranty, The RCA 11241WTGA amplified big button corded caller ID phone is perfect for meetings and conference calls. It has amplified volume up to 40 dB and amplified ringer up to 90 dB. This phone features pitch tone control, speakerphone, redial and flash function along with 3 one-touch emergency dial. The 11241WTGA can be easyly mounted on a desk or a wall. Caller ID log, call waiting, enhanced visual ringer are some of the features that lets your talks go clean with it. It also features optional vibrating ringer, 3.5mm neck loop jack and 2.5mm alert jack with vibrating pad. 11241WTGA Features: Vibrating Alert 2.5mm Alert Jack for Included Vibrating Pad, Amplified Corded Phone, Caller ID / Call Waiting, Amplified Volume - Up To 40dB, Tone Control Lets You Customize The Amplifier For Optimum Clarity, Amplified Ringer - Up To 90dB, Wall Mountable/Mount Included, Speakerphone, Backlit LCD w/ Adjustable Tilt, Enhanced Visual Ringer, Vibrating Handset Ringer, 3 One-Touch Speed Dial Keys, Redial, Flash, 3.5mm Neckloop Jack"

Clarity C420 Amplified Cordless Telephone With Caller ID $78.69 Clarity Power technology makes calls louder and clearer amplifying incoming sound up to 30dB50name and number caller ID memory (activation required)Customize three 3tone settingsLarge lighted keypad for easy dialingBright visual ring indicator in handset and base

40dB Amplified Cordless Telephone $72.03 - Geemarc amplified cordless telephone- 900 MHz- Amplification up to 40dB- Caller ID/call waiting with caller ID*- 99 name and number caller ID- 60 name and number phonebook- Large caller ID display- Tone control to shape both high and low frequencies- Vi

Clarity C4220 Amplified Cordless Telephone with Caller ID $178.31 40name and number call waiting/caller ID (activation required)Concave earpiece design creates an acoustic chamber Bright visual ringer flashes to signal incoming callsHigh contrast white LED screen is bright and easy to read4 tone settings provide a customized listening experienceDigital Clarity Power technology makes calls louder and clearer amplifying incoming sound up to 50dBGenerously spaced backlit buttons make dialing easy

Dect 6.0 Amplified Phone $92.99 CLARITY 50615 DECT 6.0 CORDLESS AMPLIFIED PHONE WITH CLARITY POWER™ & CALL WAITING CALLER ID (INCLUDES DIGITAL ANSWERING MACHINE)

55dB Amplified Freedom Phone $118.96 - ClearSounds amplified freedom phone- 55+ dB amplification (500x louder)- ClearDigitalÖ Full Digital Power- Tone/pitch control- Amplified digital answering machine- Talking Caller ID- Talking Keypad- Full duplex speakerphone- Extra loud ringer (Hi, Med,

Personix Amplified Phone 50dB $65.88 - Clarity Personix amplified corded telephone- Amplifies incoming sound up to 50dB- 2 Tone settings to customize listening- Caller ID, call waiting caller ID- Backlit display- 50# Name and number memory- 3-Line LCD- Hearing aid compatible- Digital Clarity

Cortelco ITT-2420 Amplified Big Button Telephone w/ Caller ID $89.99 "Cortelco Dignity 2420W Brand New Includes One Year Warranty, Amplified Big Button Corded Phone, Caller ID / Call Waiting, Backlit LCD, Lighted Dial Keypads, 3 One Touch Emergency Buttons, 100 Station Number Phonebook, (18dB to 40 dB) Incoming Voice Volume Adjustment, Incoming Voice Tone Adjustment (Hi or Lo), Tone / Pulse Dialing, Clock Date / Time / Alarm / Timer, Flash / Mute / Redial, Hold w/ LED Indicator, Speakerphone, On Hook Pre-Dial, Extension In-Use Indicator, Save / Delete / Edit Call Back Functions, Message Waiting Indication (Requires Phone Company Service), Message Waiting Compatible w/ FSK or Stutter Dial Tone, Name Watching, VIP Alert, Power Fail Basic Operation, Large ""Ultra-Bright"" Visual Ringer, Trilingual English / Spanish / French, Hearing Aid Compatible, Wall Mountable, 3.5mm Audio Output Jack"

Clarity 50615 Dect 6.0 Cordless Amplified Phone with Clarity Power Call Waiting Caller Id Includes Digital A $111.25 Dect 6.0 technology. Expandable to 5 handsets. Call waiting caller id. Cordless amplified phone. Features clarity power technology. 30 db amplification. Loud speakerphone. Large number display and large keys. Dual handset system. Includes digital answering machine.

Amplified Corded Phone w/ LCD $49.82 - GE Big button amplified corded telephone- Caller ID, call waiting caller ID- Tone control: 3-band tone equalizer boosts the sound of the three frequency ranges (600Hz, 1.2KHz, 2.4KHz) to compensate for the earÆs limited sensitivity in these ranges- 3.25

Clarity C4230 Amplified Cordless Telephone with Caller ID and Base Keypad $186.91 40name and number call waiting/caller ID (activation required)Concave earpiece design creates an acoustic chamber Bright visual ringer flashes to signal incoming callsHigh contrast white LED screen is bright and easy to read4 tone settings provide a customized listening experienceDigital Clarity Power technology makes calls louder and clearer amplifying incoming sound up to 50dBGenerously spaced backlit buttons make dialing easy

Fanstel ST50 Amplified Speakerphone $129.12 The Fanstel ST50 is a sophisticated telephone that can digitally adjust frequencyspecific volume levels so that any user especially those exposed to harsh noisy environments can comfortably and clearly hear a caller s voice. The Fanstel ST50 boasts a large 7.4 square inch backlit LCD display and highly flexible sound settings. Incoming voices may be amplified by up to 50dB and 52dB amplification for full voice band and high frequencies respectively. This level of amplification has been tuned to more effectively restore the perception of many phonemic distinctions common in speech than competing models. As a convenience personal volume amplification settings are automatically saved for later recall. Amplified Big Button Corded Phone. Single Line Operation. Caller ID / Call Waiting. Amplified Volume Up To 52dB. Amplified Ringer Up To 85dB. Wall Mountable. High Performance Loud Speakerphone. Extra Large Backlit LCD Display. w/ Adjustable Tilt. Adjustable Screen Contrast. Large Font Display. 99 Station Name / Number Caller ID Memory. 3 OneTouch Memory Buttons. Power Failure Operation. Voicemail LED Indicator. Bright Visual Ringer. Predial. Redial. Date / Time Display. AC Powered (Adapter Included). 3.5mm Headset Jack.

Fanstel ST45 Amplified Speakerphone $109.25 The Fanstel ST45 is a sophisticated telephone that can digitally adjust frequencyspecific volume levels so that any user especially those exposed to harsh noisy environments can comfortably and clearly hear a caller s voice. The Fanstel ST45 boasts a large 7.4 square inch backlit LCD display and highly flexible sound settings. Incoming voices may be amplified by up to 44dB and 47dB amplification for full voice band and high frequencies respectively. This level of amplification has been tuned to more effectively restore the perception of many phonemic distinctions common in speech than competing models. As a convenience personal volume amplification settings are automatically saved for later recall. Amplified Big Button Corded Phone. Single Line Operation. Caller ID / Call Waiting. Amplified Volume Up To 47dB. Amplified Ringer Up To 85dB. Wall Mountable. High Performance Loud Speakerphone. Extra Large Backlit LCD Display. w/ Adjustable Tilt. Adjustable Screen Contrast. Large Font Display. 99 Station Name / Number Caller ID Memory. 3 OneTouch Memory Buttons. Power Failure Operation. Voicemail LED Indicator. Bright Visual Ringer. Predial. Date / Time Display. AC Powered (Adapter Included). 3.5mm Headset Jack. More Features: . Mute Button. Redial. Flash. Pause. Tone / Pulse Dialing.

RCA Amplified Big Button CID Phone. Each $46.64 Manufacturer: RCA. Each. RCA amplified corded speakerphone Amplified handset volume Audio tone adjustment Amplified ringer Enhanced visual ring indicator Base speakerphone with volume control Call waiting caller ID Tilt screen display Large keypad 3 one-t

The Caller (DVD) $24.55 CALLER

Clearsounds CS-TALK500 Corded Amplified Phone $99.99 "ClearSounds CS-TALK500 Brand New Includes One Year Warranty, Frequency Control, Amplified Big Button Corded Phone, Talking Caller ID, Amplified Volume - Up To 40dB, Amplified Ringer - Up To 85dB, Wall Mountable/Mount Included, Speakerphone, Backlit LCD Display (4-Line), Easy-To-See Oversized Keypad Buttons, 64 Station Name / Number Caller ID Memory, 30 Station Phone Directory / Dialer, 3 One-Touch Memory Buttons, Pre-Dial Number Verification (Phone Speaks Back Through Speakerphone)"