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Feature Benefit
Voice/Fax over IP Voice and fax traffic are transport independent, because IP traffic at Layer 3 can travel over any Layer 1 or Layer 2
media, including ISDN, leased lines, serial connections, Frame Relay, Ethernet, Token Ring, and Asynchronous
Transfer Mode (ATM).
Voice/Fax over Frame Relay Applications requiring voice and fax traffic to be routed directly over Frame Relay networks will take advantage of
FRF.11 and FRF.12 VoFR and fragmentation standards. This solution also uses features found only in Cisco IOS
software for maintaining voice quality. VoIP can also be transported over FR.
Voice over ATM Transport voice directly over ATM networks using AAL 5 encapsulation. Leverages existing ATM networks as a
direct transport method for voice. VoATM requires ATM interfaces such as T1/E1 ATM, IMA, DS3/E3 or OC-3, or
DSL WICs. VoIP can also be transported over ATM.
Connection Trunk Creates a permanent tie-line replacement structure (digital-to-digital, digital-to-analog, or analog-to-analog
capabilities).
LVBO (Local Voice Busy-Out) Automatically busy out any desired voice trunk line to a PBX or PSTN when a direct WAN or LAN connection to the
router is down. Also, busy out a far end trunk connection when configured for Connection Trunk.
Caller ID Support Per-port configurable caller ID to phones connected to analog FXS voice ports using per call un-blocking if desired.
Also provide caller ID over analog FXO and DID voice interfaces. Interoperates with analog phones, PSTNs, PBXs,
H.323 terminals (i.e. Microsoft Netmeeting), Cisco Call Manager and IP phones.
PSTN Fallback Uses Service Assurance Agent (SAA) to determine latency, delay and jitter and provide real-time ICPIF calculations
before establishing a call across an IP infrastructure. SAA packets emulate voice packets receiving the same priority
as voice throughout the entire network. A superior method to data and ping packets for determining congestion
levels.
Robust Router-Based Voice
Gateway Solution
A single device solution, which reduces management costs, minimizes latency, and has extremely low failure rates,
compares favorably with most other voice over IP vendors’ PC-based solutions. These solutions still require a LAN
router and, therefore, result in not only increased management expenses but also higher PC failure rates.
Modular Architecture Support any combination of voice and data within a single platform. Allows users to add functionality at any time
after deployment.
Voice and Fax over Same Port Ports can be used for both voice and fax traffic--no dedicated ports are required.
Works with Existing Phones,
Faxes, PBXs, and Key Systems
No user retraining is required.
H.323 v3/v2/v1 Compatibility The Cisco voice/fax modules are interoperable with numerous emerging voice and videoconferencing applications,
such as Microsoft NetMeeting, Intel Internet Phone, LAN-based IP telephony equipment, and Cisco Call Manager.
High-Performance DSP
Architecture
The Cisco voice/fax modules offer extremely low latency, which is essential for high-quality voice and fax traffic; the
DSP architecture also enables all critical functions to be handled in software, which allows for simple code updates,
scalability, and new features.
ITU Standards G.729, G.729a/b,
G.711, G.723.1, G.726 and
G.728
These are standards-based compression technologies allowing transmission of voice across IP, Frame Relay and
ATM. G.711 is standard 64 kbps PCM modulation using either u-law or A-law.
Advanced Quality of Service
(QoS) Mechanisms
These configurable Cisco IOS features reserve appropriate bandwidth and prioritize voice and fax traffic to ensure
transparent delivery of toll-quality voice and fax. They include Resource Reservation Protocol (RSVP), Queuing
Techniques (such as Low Latency Queuing), IP Precedence, and DiffServ Code Points.
Compressed Real-Time Protocol
(cRTP)
These Cisco IOS features offer RTP header compression and packet fragmentation techniques that allow toll-quality
voice and fax transmissions over low-bandwidth (56K and 64K) WAN connections.