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Expected cost savings:
1 No parallel operation of LAN infrastructure and telephony solution or
substitution of PABXs
1 Installation of multimedia capabilities in each user device or substitution of
system specific telephone sets through standards based IP phones
1 Integration of ISDN and POTS by use of “Voice over IP” gateways
1 Multiple use of WAN connections (bandwidth requirements have to be checked
in detail)
1 Direct phone calls over IP instead of using „expensive “ ISDN services
1 Telephony integration in office applications
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ISDN … Integrated Services Digital Network
POTS … Plain Old Telephone System
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Examples for software fetures (extract of product description):
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Point-to-Point Calling via e-mail address
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Telephone quality real-time speech
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On/Off-line integrated Voice Mail System
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Call Blocking
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Complete Caller ID
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Call Conferencing
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Call Transferring
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Personal WebPhone Directory
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On-hold MIDI Music
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Last Party Redial
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Conversation Encryption
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Integrated, context sensitive, interactive Multimedia User Manual
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User configurable Sound Effects
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Enhanced Graphic User Interface for simplified ease of use
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Operates on the Internet as well as over any TCP/IP based LAN or WAN
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"How to" Guide
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The user is always reachable by his or her caller identification (or VoIP address like
SIP URI), regardless of the used device
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SIP … Session Initiation Protocol
URI … Uniform Resource Identifier (here: SIP address)
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Fax modem standards:
1 ITU-T V.17: up to 14.400 bps
1 ITU-T V.21: 300 bps
1 ITU-T V.29: up to 9.600 bps
1 ITU-T. V.34: up to 28.800 bps
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ITU-T … International Telecommunications Union – Telecommunication
Standardization Sector
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Explanation :
1 Single Station Single Authentication: only one station may be authentified at a
switch port
1 Multiple Station Multiple Authentication: one switch port may atúthentify multiple
stations individually and get individual access
1 Vendor specific solution: different vendors support proprietary functions to solve
the explained problem (e.g. Cisco Network Admission Control)
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IP … Internet Protocol
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ITU-T G.165 describes requirements to echo cancellation
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cRTP … Compressed Real-time Transport Protocol
IP … Internet Protocol
MPLS … MultiProtocol Label Switching
RTP … Real-time Transport Protocol
TCP … Transmission Control Protocol
UDP … User Datagram Protocol
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