Airline reservations (“Can I connect through Philadelphia instead?”)
Hotel reservations (“Does that room have a view of the ocean?”)
Ticket sales (“Can I get four seats together?”)
Stock trading (“Will I make the split requirements?”)
Call Center Without VoIP Call Me 1. User clicks Web Call Enter Information: Name: Account #: Phone #: 2. User enter information Call information, Account Information, Etc. 3. Web site forwards To call center PSTN 5. User answers call, Conversation begins 4. Agent places PSTN call
Call Center With VoIP 1. User clicks Web VoIP Call VoIP Call Internet Call information, Account information, Etc. 2. VoIP software uses same IP connection to Web site 3. Web site forwards all Info to call center Multimedia pc with VoIP software 4. Conversation through VoIP software
The Web Added to the Call Center PSTN PBX/ ACD Database Voice network to telephones Agent with telephone and pc Agent with telephone and pc Agent with telephone and pc Internet Web Server VoIP Gateway Still two networks
The Web Added to the Integrated Call Center PSTN PBX/ACD VoIP Gateway Database Agent with telephone and pc Agent with telephone and pc Internet Web Server Only one network
Address translation (supports the use of proprietary addressing schemes, such as mnemonics, nicknames, or e-mail address)
Admissions control (control the setup of VoIP calls between their terminals and gateways and the rest of the world; access granted or denied based on authentication, source or destination address, time of day, etc.; essentially a security mechanism)
G.711 is the international standard for encoding telephone audio on an 64 kbps channel. It is a pulse code modulation (PCM) scheme operating at a 8 kHz sample rate, with 8 bits per sample, fully meeting ITU-T recommendations.
ITU-T G.722 is the benchmark coder for wideband speech coding quality. The speech signal is sampled at 16000 samples/second. G.722 can handle speech and audio signal bandwidth up to 7 kHz, compared to 3.6 kHz in narrow band speech coders. G.722 coder is based on the principle of Sub Band - Adaptive Differential Pulse Code Modulation (SB-ADPCM). The signal is split into two sub bands and samples from both bands are coded using ADPCM techniques. The system involving G.722 coder can be used to work in three modes 64, 56 and 48 kbit/s. The latter two modes will allow an auxiliary data channel of 8 and 16 kbit/s respectively, within the 64 kbit/s channel.
G.723.1 is a speech compression algorithm standardized by ITU. G.723.1 has dual coding rates at 5.3 and 6.3 kbps. The vocoders process signals with 30 ms frames and have a 7.5 ms look-ahead and low distortion while passing DTMF tones through. The input/output of this algorithm is 16 bit linear PCM samples.
ITU-T G.728 is low delay speech coder standard, for compressing toll quality speech (8000 samples/second). The typical application of this speech coder is in telephony over packet networks, especially voice over cable and VoIP. This is a very robust speech coder, with very good speech quality, comparable to 32 kbit/s ADPCM. G.728 coders are based on the principle of Low Delay-Code Excited Linear Prediction (LD-CELP).
G.729 is an 8 kbps Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP) speech compression algorithm approved by ITU-T. G.729 Annex A is a reduced complexity version of the G.729 coder. G.729 AB speech coder was developed for use in multimedia simultaneous voice and data applications. The coder processes signals with 10 ms frames and has a 5 ms look-ahead which results in a total of 15 ms algorithmic delay. The input/output of this algorithm is 16 bit linear PCM samples.
Forward error correction (FEC) is incorporated in the algorithm to achieve noise immunity of the data stream by including control bits into it.
E.164 is an international telephone numbering plan
A fully qualified E.164 number is designated by a country code, an area or city code, and a phone number
ENUM allows users to access Internet-based services and resources from Internet-aware telephones, ordinary telephones connected to Internet gateways or proxy servers, and other Internet-connected devices where input is limited to numeric digits.