Voice over IP (VoIP)
102
9.
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:
■
Telephony via Internet provides cheaper charge-models for telephone services.
For telephony directly via the Internet, only the cost of data transmission is
incurred. Various Gateway providers can provide crossover into the PSTN
(“Public Switched Telephone Network”) for a fee. As well as standardised pro-
tocols 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 communication
networks into a single communications network can provide considerable
savings. The OpenCom 100 gives users all the features of system telephony
through its use of an IP-based protocol. Furthermore, the standardised SIP pro-
tocol 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 OpenCom 130 / 150 provides you with
the following options (see also
■
You can use low-cost “SIP trunk lines” with your existing Internet connection
■
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
■
With a M100-AT4 interface card (4 analogue trunk lines, also available for
OpenCom 131) you can also use the external IP Gateway 1 for SIP telephony
VoIP Telephony via intranet with the OpenCom 100 offers the following possibil-
ities:
■
Use of IP-based system telephones and of SIP telephones connected to Cat5
twisted-pair ethernet cables
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