A allows Internet telephony service providers to deliver telephony services and unified communications applications offering voice, video, and other streaming media applications such as desktop sharing, web conferencing, and shared whiteboard technologies.

SIP Trunk

Explanation:

   The SIP is stand for the session initiation protocol trunk is one of the service that is specifically provided by the service provider and the main purpose of the SIP trucking is to manage the VoIP call process (Voice over IP).

According to the given question, SIP is one of the protocol that allow telephony services for the communication purpose and it also offer the video, Message, media and the voice application and these process are control by using this type of technology.  

 Therefore, SIP Truck is the correct answer.  

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