SIP Softswitch
It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
This service allows called party to listen to the audio or video announcements of callers before connection. The caller can choose a message that will be played and conditions by which the message will be plaid over. For example, before the subscriber answers the call, they will hear audio message with the name of the person who is calling.
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