Aastra OpenCom X320 User Guide - Page 93
Voice over IP (VoIP
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Voice over IP (VoIP) 8. 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 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 you 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 X320 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 OpenCom X320 provides you with the following options (see also SIP Telephony starting on page 103): ■ 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 VoIP Telephony via intranet with the OpenCom X320 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 91