June 3, Voice over IP

Transcription

1 Jue 3, 1999 Voice over IP This applicatio ote discusses the Hypercom solutio for providig ed-to-ed Iteret protocol (IP) coectivity i a ew or existig Hypercom Hybrid Trasport Mechaism (HTM) etwork, reducig the cost of voice commuicatios. Topics iclude: Overview Features Beefits Operatioal Theory

2 Voice over IP Applicatio Note Overview Voice traffic is typically routed over a dedicated lie. The Hypercom voice over IP (VoIP) solutio trasmits voice over the low-cost Iteret versus a more expesive dedicated lie. May Iteret service providers (ISPs) are available, over 2600 today. VoIP is a router-based ifrastructure ad provides the potetial of cosolidatig voice ad data traffic. IP telephoy applicatios are: Phoe-to-Phoe, or Voice Gateway Operatio: These applicatios route calls over a Frame Relay or IP, use a compressed packetized voice chael, ad provide echo cacellatio. Fax-to-Fax, or Fax Gateway Operatio: These applicatios route fax over a Frame Relay or IP ad provide termiatio for fax modems of 2400 bps to 14.4 Kbps. Phoe-to-PC, or Gateway Operatio: These applicatios covert IP voice packets for trasmittio over Legacy telephoe etworks. The type of service providers that use the Hypercom VoIP solutio are: Carriers, providig iexpesive log distace telephoy ISPs providig competitive ew voice reveue streams Eterprise, virtual private etworks, providig voice ad fax savigs through cosolidatio of voice ad data The Hypercom VoIP etwork follows the H.323 IP iterface stadard that supports: G voice packets at 6.3 Kbps, which is the compressed packetized voice CCITT G3 fax packets, with modem speeds of 2400 bps to 14.4 Kbps A basic voice cofiguratio i a HTM eviromet is show i Figure 1. Four differet iterface optios are show: Etheret or serial iterface to a IP backboe ad serial or T1 or E1 iterface to a Frame Relay backboe. Frame Relay Frame Relay IP IP Cetral Node A Same as at right LET61 Call Cotroller MFR48-8 MFR48-8 MFR48-8 Iterface Dedicated IENView V.35 V.35 or PPP Etheret PBX Wik Start CSU Router Call Accoutig Group PC IENView Frame Relay Frame Relay IP IP CSU Router V.35 V.35 or PPP Etheret Same as at right LET61 Call Cotroller MFR48-8 MFR48-8 MFR48-8 PBX Wik Start Figure 1. Basic digital voice over IP cofiguratios Copyright 1999 by Hypercom Corporatio 2

3 Voice over IP Applicatio Note Network Maagemet IENView is the etwork maagemet tool from Hypercom that is used to cofigure ad moitor the VoIP process. IENView is a GUI-based applicatio that rus i Widows 9X ad NT eviromets. The cofiguratio maagemet icludes automatic route discovery, detailed port cofiguratio, ad call pla cofiguratio. Digit traslatio, a dialed-digit isertio ad removal feature that is similar to a PBX, is part of call routig. Routig cofiguratio ad TDM bus assigmets are simplified with the use of voice mappig. Call accoutig records are ow captured, icludig start time, ed time, ad duratio of each call. The call records ca be set to exteral Statio Message Detail Record (SMDR) locatios or priters o the etwork. Statistical moitorig icludes truk use ad use. The problem maagemet features iclude error logs, lik status, call trackig, error statistics, ad etwork maps. Diagostics have bee improved with the availability of call evet tracig. Multiple call cotroller evets ca be captured ad displayed to help ivestigate calls Copyright 1999 by Hypercom Corporatio 3

4 Voice over IP Applicatio Note Features Hypercom s VoIP applicatio provides the ability to: Compress voice with a proprietary compressio algorithm or optioal ITU stadard G.723.1, G.726, G.727, ad G.729A compressio algorithms Fie tue voice with iput ad output level settigs ad jitter correctio Route voice with fixed or switched paths i maual or auto-dial mode Support itra-ode callig, that is calls placed betwee voice ports withi a sigle ode Support CCITT G3, V.27, ad V.33 fax o ay voice chael Provide store-ad-forward ad digit traslatio, a dialed digit isertio ad removal feature similar to a PBX Capture call accoutig iformatio, icludig start time, ed time, ad duratio of placed calls o each voice iterface Trasmit call accoutig iformatio o a asyc or LAN iterface Provide call evet tracig, the capture of call cotroller evets for diagostics Provide ehaced lie utilizatio moitorig Support 2-wire E&M Type I ad V aalog iterfaces Support 4-wire E&M Type I, II, ad V aalog iterfaces Support 2-wire FXS ad FXO aalog iterfaces Support T1 iterface with E&M Wik or Immediate start sigallig Support E1 iterface with balaced or ubalaced iterfaces Support ISDN PRI chaels Support MFR2 ad DTMF sigallig Provide call supervisio facility i a DLA64 aalog voice port processor Place a call cotroller o a DLA64 aalog port processor, or a CID61 or port processor with or without a voice compressio module Eter commads remotely with a commad lie iterface applicatio Sed a pig commad from the commuicatios port iterface Copyright 1999 by Hypercom Corporatio 4

5 Beefits Voice over IP Applicatio Note Usig the Hypercom VoIP solutio elimiates or greatly reduces costs ormally associated with a leased-lie coectio. The advatages of usig Hypercom VoIP iclude: Reduced log distace telephoy costs. Lowered ifrastructure cost. High-performace voice compressio that reduces the required badwidth. Ability to ru voice, fax, data traffic over IP or Frame Relay s. Oe card provides both VoIP ad VoFR iterfaces. High voice quality with a optioal 16 ms echo cacellatio. Ability to sed call records to a exteral SMDR. Simplified voice cofiguratio iterface. Comprehesive statistic collectio of maiteace iformatio. Modem relay. Aalog modem traffic is set over IP without coversio Copyright 1999 by Hypercom Corporatio 5

6 Voice Over IP Operatioal Theory Voice over IP Applicatio Note Digital ad aalog voice ca be set cocurretly over the same VoIP etwork. A call pla cotais a directory of all voice resources withi a etwork ad defies how calls are routed. A call cotroller i each ode directs outgoig calls based o the iformatio stored i the call pla. A call pla maages voice call routig i a Hypercom etwork. The call pla cotais logic that dyamically lears the most frequetly used prefixes. Wheever a ew statio umber is added to the etwork, the umber is automatically leared, which dramatically reduces the umber of times a call pla must be loaded ito a etwork. Depedig o the call selectio, a call ca begi as either digital or aalog voice ad be completed as digital or aalog voice. Digital voice is received from a PBX, compressed, the set over the IP etwork to the receivig ode. Aalog voice is received from a PBX or hadset, digitized, compressed, the set over the IP etwork. The receivig call cotroller directs the compressed voice to the correct voice compressio resource defied i the call pla. The compressed voice is decompressed, coverted back to aalog if ecessary, the set to the receivig PBX or hadset Copyright 1999 by Hypercom Corporatio 6