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Service Providers can further enhance their VoIP service
offerings by adding a VCO/4K programmable switch
(Figure 4). The VCO/4K enables more advanced voice
services such as voice/fax messaging, intelligent 800-
number routing, voice-activated dialing, calling card,
personal-assistant services, and Web-based conferencing.
In addition, it can integrate seamlessly into existing
telecommunication infrastructures with application-
contr olled Signaling System 7 (SS7) signaling to connect to
public networks worldwide. VCO/4K performs translation
of SS7 ISUP, and Transaction capabilities application part
(TCAP) to PRI, so service providers can integrate a broad
range of serviceswitchingpoint (SSP) capabilities on new and
existing VCO/4K switches at a fraction of the cost of a n
access tandem switch.
With the advanced network in place, a service provider
can offer unified messaging, Internet call waiting (alerting
users to incoming voice calls while on-line) and virtual
second line (ability to make and receive voice calls from the
user’s PC while on the Internet). These services can greatly
increase th e Internet SP’s (ISP’s) revenue st reams from
Internet access subscribers.
To expand its service coverage, an individual ISP might
choose to par tner with ISPs in other regions or join a
consortium to provide widespread coverage. Settlement firms
allow ISPs to provide national coverage by exchanging voice
traffic with other ISPs. Cisco has also introduced support for
Open Settlements Proto col, a standa rd being developed t o
facilitate the exchange of VoIP traffic.
Figure 4 SS7 Enabled Long Distance and Enhanced Services Including Unified Messaging, Voicemail, Calling Card, Customized Billing, and Internet Call Waiting
Digital Interfaces (T1/E1 PRI) This feature enables higher port densities for increased scalability.
H.323 Compatibility TheCisco AS5300/Voice Gateway gatewaysinteroperatew ith H.323-compliantvoice and videoconferencing applicationssuch asMic rosoft NetM eeting, as well as third-party H.323-compliant gatew ays and gatekeepers.
High-Performance DSPs High-performance (100 mips) DSPs have plenty of horsepower to support the full range of available high-compression/low -delayCODECs,including G.711,G.729,G.729a,and G.723.1. The DSPs fully support integrated echo cancellation, voice activity detection,silences suppression, jitter buffering, and comfort noise generat ion to ensure uniform, high-quality voice conversations. Fullcoverage for all voice c hannels is provided.
Low-Latency Design The Cisco AS5300/Voice Gateway is designed for minimal latency, whic h is essential for high-qualit y voice and fax traffi c.
Real-Time Fax Relay Thisfeature enablesreal-time fax transmissionbetween Group III fax machines operatingat up to 14,400bps.The Cisco AS5300/VoiceGateway voice featurecard interfaceswith thesourceand target faxmachinesby appearingto bea faxmachine.Real-TimeFax Relayaccommodates delays in the net works using T.30 spoofing. Incoming fax transmissions are demodulated before rel ay so that the 64Kpulse-code modulated fax cal l consumes only 9.6 Kbps or 14.4 Kbps of bandwidth across the data netw ork per second of faxtransmission.
Interoperates w ith Cisco 3600 and Cisco2600 Voice M odules
Cisco offers a family of scalable packet voice solutions for businesses. Cisco AS5300/Voice Gateway also interoperates w ithother gatekeepers.
M ulticlass M ultilink PPP Fragmentationand Interleaving
This feature reduces large data packets into small packets, prevents voice packets from being stuck behind large packets, andreduceslatency.
Cisco Voice M anager CVM is a c onfiguration, monitoring, and reporting application for pac ket telephony gateway netw orks. It provides call historyreports, callvolume reports, andquality of voice exception reportsusing theITU-TG.113 specification for voice quality. This Javaapplication runs on Windows NT or Solaris.
Cisco Voice M anager
Cisco Voice Manager (CVM) is a Web-based network
management application that configures and monitors Cisco
voice-over-IP (VoIP) gateways. Network administrators can
implement dial plans, monitor call activity and call-quality
parameters in real time, and pr oduce detailed reports
showing call history and delivered call quality. The
AS5300/Voice Gateway provides a full suite of general and
voice-specific Simple Network Management Protocol
(SNMP) Management Information Base (MIB) variables.
High Performance Co-Processor Design This is a highly integr ated single-device solution that minimizes packet latency, essential for high- quality voice. PC-basedsolutions using loosely coupled components cannot achieve the same performance characteristic s.
M odular Architecture The system provides flexibility and investment protecti on. The Cisco AS5300/Voice Gateway modular design allow s for scal ingfrom24to 120 voice connectionsper device.In addition,modem andvoice modules can both be used in thesameAS5300,givingcustomers added flexibility.
Compatible w ith Existing Phones, Faxe s,PBXs, and Key Systems
This feature provides a standard interfac e to your existing telephony equipment. Users continue to use familiar equipment, withno special adaptation or retraining.
Real-Time CODEC Selec tion Thissophisticated DSP architecture supports simultaneous H.323 capability negotiation on all channels. TheCisco AS5300/VoiceGateway voice feature card l oads appropriate voice or fax CODEC on the fl y for al l 120 channels, simultaneously if necessary.
E.165 Echo Cancella tion This feature provides echo cancellati on into the circuit-sw itched netw ork with a tail of up to 32 msec, more than adequate tosupport carrier quality.
Adaptive Jitter Buffering Adaptive jitter buffer intelli gently balances delay and packet loss through the gateway for maximum call clarit y and quality.
Voice Activity Detection (silencesuppression)
Bandwidth on the packet network is used only when someone is speaking.During silentperiods of a phone call (up to 50percentof the time), bandwidth is available for data traffic .
Front-End Clipping (Time BeforeSpeech Activity is Detected Aftera Period of Silence)
0 msec
Hang-Over Time (Max imum Time BeforeSilence is Recognized After a Period ofSpeech)
200 msec
Comfort Noise Regenera tion To better simulate phone calls over voice netw orks, this feature reassures the phone user that the connection is beingmaintained, even when no voic e conversation is in progress.
Voice Quality Statistics Call parameters used for the ITU-T G.113 recommendation for voice quality impairment calculations are supplied. These includeCODEC type, bandwidth used, end-to-end delay, circ uit noise, loudness, echo, packet loss, and other statistics.
ITU Standard CODECs G.711, G.729, G.729a,
and G.723.1
These standards-based compression technologies, allow for high-quali ty voice and compression as low as 53kbps to minimize
bandwidth requir ed to transmit packet telephony.
Compressed Real -Time Protocol (CRTP)and Multil ink PPP Fragmentation andInterleave
Theseare header compression andpacketfragmentation techniquesthat allow toll-qualityvoiceand faxtransmissions over lowbandwidth WAN connections.
Dial Plan Ma pping This feature entails mapping of dialed phone numbers to IP addresses. Mapping c an be programmed directly in the CiscoAS5300/Voice Gateway or alternately maintained in H.323 gatekeepers that communicate to multiple gatew ays via H.323 RASmessages.
Number Expansion This feature enables speed dialing and simplifies dial plan configuration. It expands all numbers matching a defined pattern, soyou need to configure and dial only the last few significant digits of the number.
Direct Inward Dial Direct Inw ard dial allow s direct dialing of eac h user sitting behind a PBX; there is no need to dial the main number and then dialan extension. This feature is also useful in service provider applications w ith a VCO/4K used as a service node.
Secondary Dial Tone This featureallows explicitaccessto a VoIPnetworkfor two-stage calling implementation.Thefirst dial tone is generatedby thelocal phone c ompany and the second dial tone, or prompt, is generated by the VoIP carrier.
Call Progress and Tone Generation This feature generates call pr ogress tones, including dial, busy, ring-back, and congestion tones, with local country variants.
Dual Tone M ultifrequency (DTMF)Transport
This featureenables theuse of touch tones for voice-mail applications andIVRsystems;it also supports out-of-band DTMF relaywhen high-compression CODECs such as G.723.1 are used, which may corrupt inband DTMF tones.
Fax Autodetect Any port can accept a fax relay call; the port is automatically reconfigured when an incoming fax call is detected. A scalabledesign givesthe Cisco AS5300/Voice Gateway the unique abilityto reload all fax algorithms simultaneously, meeting the stringenttiming requirements of legacy fax machines.
-law and A-law Encoding on Any Channel This featurefacilitates international callingby transparentlytranscoding between -lawencoding (usedin T1countries)and a-law(used in E1 countries).
M usic on Hold Threshold This feature offers intelligent music on hold handling.
IP Precedence The Type of Service (ToS) field in an IP header provides thr ee settable precedence bits. Voice traffi c should be c onfigured w ith IP precedence of 5.This capability allows the netw ork to prioritize voice packets above other traffic , thereby assuring highest voice quality over congested network.
Queuing M echanisms Queuing mechanisms include W FQ, priority queuing and c ustom queuing. These are confi gurable Cisco IOS software capabilities that r eserveappropriate bandwidth and prior itize voice and fax traffic to ensure transparent delivery of toll-quality voice and fax.
CAR The committed access rate (CAR) feature performs both pac ket classification and bandwidth management functionality. The packet classific ationfeatures let users partition netw ork traffic into multiple priority levels or cl asses of service (CoSs). The network operator c an define up to six CoSsusing the three prec edence bits in the ToS field in the I P header. The operator can then use the other QoS features to assign appropriatetraffic- handling policies, including congestion management, bandwidth allocation, and delay bounds for each traffic class.
WRED WRED features provide network operators with pow erful congestion-control c apabilities designed to provide preferential treatment forpremium-classtraffic underc ongestion situationsw hile concurrentlymaximizing network throughput and capacityutilization and minimizing packetloss and delay.
RSVP RSVP allows Cisco voice gateway to request/ reserve required bandw idth for a call .
Cisco Systems has mor e than 200 offices in the following countries. Addresses, phone numbers, and fax numb ers are listed on t he
C i sc o C on n e c t i o n O n l i n e W e b s i t e a t h t t p : / / w w w . c i s c o . c o m / o f f i c e s .
Ar gent ina • Au st ralia • Austr ia • Belgium • Br azil • Can ad a • Chile • Ch ina • Co lom bia • Co st a Rica • Cro atia • Czech Rep ublic • Den mar k • Du bai, UAE
Finland • France • Germany • Greece • H ong Kong • H ungary • India • Indonesia • Ireland • Israel • Italy • Japan • Korea • Luxembourg • M alaysia
M ex ico • Th e N et herland s • N ew Z ealan d • N orway • Peru • Ph ilipp ines • Po land • Por tu gal • Puerto Rico • Ro mania • Ru ssia • Saud i Arab ia • Sin gapo re
Slo vakia • Slo ven ia • Sou th Afr ica • Sp ain • Swed en • Switzer lan d • Taiwan • Th ailan d • Tu rk ey • Uk rain e • Un ited Kin gdo m • Un ited St ates • Ven ezu ela
Corporate H eadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAhttp://www.cisco.comTel: 408 526-4000
800 553-N ETS (6387)Fax: 408 526-4100
European HeadquartersCisco Systems Europe s.a.r.l.Parc Evolic, Batiment L1/L216 Avenue du QuebecVillebon, BP 70691961 Cour taboeuf CedexFrancehttp://www-europe.cisco.comTel: 33 1 69 18 61 00Fax: 33 1 69 28 83 26
AmericasHeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAhttp://www.cisco.comTel: 408 526-7660Fax: 408 527-0883
Asia HeadquartersNihon Cisco Systems K.K.Fuji Building, 9th Floor3-2-3 MarunouchiChiyoda-ku, Tokyo 10 0Japanhttp://www.cisco.comTel: 81 3 5219 6250Fax: 81 3 5219 6001
PTT Certifications CTR4
CTR 12/13
JATE
TS 014
SS 63 63 34
PD 7024
BE/SP-103
HKT CR11 and CR13
FCC Part 68
CS-03
NEBS Compliance The Cisco AS5300/Voice Gateway is NEBS Level 3 compliant.