Caller ID Control
The function allows you choosing a number that you want in order to light up during the call to traditional telephones. You can also unlist the number and it won’t light up.
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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