Selective Call Routing
The system allows you to create a list of numbers, which will be redirected in case if the telephone, to which they call, is unavailable. For example, somebody calls you to the office during your absence and the number of the subscriber who is calling is in the list, accordingly this call will be redirected for instance to the phone of your car or some other indicated by you in the system. In case if at the moment of your absence you will be called from a number that is not in the list, the call will not be redirected but most likely will be sent to the voice mail. Thus, you will never miss a call from partners, who are important to you.
Obviously SIP is considerably better than H.323 and complies with the understanding of IP-telephony as a global mass IP-service, and it should be implicitly considered right this way. And as SIP is able to serve not only telephony but also any communications at all in the real time over the IP-protocol; obviously it should become a base for other IP-services not yet existing but will appear in the future, as well.
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