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SIPAbbreviation for session initiation protocol. The applied standard in Telesis systems is RFC 3261. Telesis systems integrate both packet and circuit switching technology. A Telesis system featuring an integrated SIP registrar/proxy/server provides an economical way for administrators to manage a central database of phone numbers without the expense of a separate-box registrar/proxy/server solution. Telesis systems can register to multiple SIP registrars/proxies/servers at the same time. This allows address resolution of a Telesis system from either side and results in flexibility for multipath VoIP access applications. Telesis systems support numerous SIP users (entities) which can be user agents or registrars/proxies/servers. Number/IP translation is performed through advanced routing algorithms. Together with the integrated registrar/proxy/server, call authorization, call management, enhanced billing functions, flexible routing algorithms, and extensive business telephony features make a Telesis system serve as a feature-rich communication platform. Connecting to the long distance call operator can be both over TDM and IP at the same time. The Telesis system may register at the external registrar/proxy/server of the operator as an option. With the advanced routing algorithms and alternate routing capability, TDM calls from a terminal equipment connected to the system may be routed to a selected operator over the IP or PSTN. Alternate routing capability provides automatic fall back to the PSTN if the IP network is inaccessible. Furthermore, it is possible to define which release causes stated in SIP response codes will lead to the alternate routes being used. Internal Links |