Voice over IP (VoIP)
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Voice over IP (VoIP)
The term “Voice over IP” describes the usage of IP-based data networks for
telephony. It is possible to distinguish between two different types of VoIP:
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Telephony via Internet provides cheaper charge-models for telephone
services. For telephony directly via the Internet, only the cost of data trans-
mission is incurred. Various Gateway providers can provide crossover into
the PSTN (“Public Switched Telephone Network”) for a fee. As well as
standardised protocols such as SIP and H.323, proprietary protocols such
as the Skype network, are used. Voice and service quality via Internet is
often indeterminable because they are dependent on the communication
lines of various service providers. which have been optimised for data
communication
●
Telephony via Intranet enables joint usage of existing infrastructure for
telephony and for data communication. Integrating the two communi-
cation networks into a single communications network can provide consid-
erable savings. The Forum 523/524 gives users all the features of system
telephony through its use of an IP-based protocol. Furthermore, the
standardised SIP protocol can also be used on the intranet. The control of
the data connections used makes it possible to define exactly the voice and
service quality.
VoIP telephony over the Internet using the Forum 523/524 provides you with
the following options (see also
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You can use “SIP trunk lines” with your existing Internet connection
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You can use the services of a SIP gateway service provider to access the
public telephone network (PSTN)
●
Automatic fallback (bundle overflow) to ISDN connections in case of the
breakdown or over-occupancy of the SIP connection
VoIP Telephony via intranet with the Forum 523/524 offers the following
possibilities:
●
Use of IP-based system telephones and of SIP telephones connected to
Cat5 twisted-pair ethernet cables
●
Use of IP-based system telephones and of SIP telephones via VPN, RAS,
Branch or WLAN connections
Summary of Contents for forum 523
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