Aastra OpenCom 510 User Guide - Page 117
Voice over IP (VoIP - sip trunk
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Voice over IP (VoIP) 11. 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. optimised for data communication Voice and service quality via Internet, is often indeterminable because you are dependent on the routes 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 510 gives users all the features of system telephony through its use of an IP-based protocol. The control of the data connections used makes it possible to define exactly the voice and service quality. Telephony over the Internet using the OpenCom 510 provides you with the following options (see also SIP Telephony starting on page 124): ■ 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) you can also use the external IP Gateway 1 for SIP telephony VoIP system telephony with the OpenCom 510 offers the following possibilities: ■ Use of IP-based system telephones connected to Cat5 twisted-pair ethernet cables ■ Use of IP-based system telephones via VPN, RAS, Branch or WLAN connections 115