VoIP Telephony

VoIP telephony replaces old and expensive telephone systems and provides additional functions that are affordable.
VoIP Telephony

Working place with telephone system - © weissdesign /

© weissdesign / Fotolia.comVoice over IP (VoIP) uses Internet protocols to deliver voice communication over the network (e.g. the Internet). The telephone system consists only of a software and new terminals that are connected to the companies network like a PC. The telephone call takes place either classical over ISDN or over the Internet.

To connect into the conventional telephone network, so called media boxes are used between the IP network and the ISDN / analog network. They can be redundant if desired.

Alternatively the VoIP telephony can take place over a SIP provider. Especially for telephone calls to foreign countries, cheaper scales are possible thereby, because the telephone call is broadcast over the Internet or the SIP provider to the conventional network.


What are the advantages of VoIP?

  • It will be the general available telephone standard: Terminals of different producer can be connected.
  • Cost savings: consistent network and realizing of a telephony services basing on IP infrastructures
  • Server as telephone system: expensive telephone systems are not necessary any more
  • Flexibility: to use the personal telephone numbers and direct dials all over the world, the only thing you need is a data connection to the VoIP server
  • Independency of the location: VoIP is independent from the location as long as there is a connection to the Internet
  • Broadcast in real-time without time delay
  • Administration of VoIP telephony over a web interface
  • Email notification: faxes are sent as PDF-attachments and voice mail box messages as sound attachments to the corresponding mail address
  • Interactive voice response system (IVR)
  • Only one main number is needed, through extension numbers the call is transfered to different office locations. Additionally, each phone extension can be provided with an own answering message or each user can have his own fax extension number.
  • Easy connection between different locations (transferring of telephone calls)
  • Possibility to connect VoIP to diverse software (Internet browser, mail program, enterprise resource planning systems etc.)


How can we switch to VoIP telephony?

  • Soft migration: The switch to VoIP takes place step by step. At the beginning, both technologies (including the existing telephone system) are used parallel.
  • Telephones: telephones that are IP compatible of different producers can be used (e.g. SNOM, Grandstream etc.)