Pre-alerting Announcement

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.

Providers in database: 6433

Detailed description of SIP protocol

SIP protocol was made within IETF (Internet Engineering Task Force) – organization occupied with establishing Internet standards and general standards concerning TCP/IP protocols.

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