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2. Click-to-call - Wikipedia

   en.wikipedia.org/wiki/Click-to-call

   Click-to-call. Click-to-call, also known as click-to-talk, click-to-dial, click-to-chat and click-to-text, is a form of Web-based communication in which a person clicks an object (e.g., button, image or text) to request an immediate connection with another person in real-time either by phone call, Voice-over-Internet-Protocol ( VoIP ), or text.

3. Skype for Business - Wikipedia

   en.wikipedia.org/wiki/Skype_for_Business

   Skype for Business (formerly Microsoft Lync and Office Communicator) is an enterprise software application for instant messaging and videotelephony developed by Microsoft as part of the Microsoft 365 (formerly Office) suite. It is designed for use with the on-premises Skype for Business Server software, and a software as a service version ...

4. DTMF - Wikipedia

   en.wikipedia.org/wiki/Dtmf

   The red keys in the fourth column produce the A, B, C, and D DTMF events. Dual-tone multi-frequency signaling ( DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. [1] DTMF was first developed in the Bell System in ...

5. Telephone keypad - Wikipedia

   en.wikipedia.org/wiki/Telephone_keypad

   A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...

6. Skype for Business Server - Wikipedia

   en.wikipedia.org/wiki/Skype_for_Business_Server

   Skype for Business Server (formerly Microsoft Office Communications Server and Microsoft Lync Server) is real-time communications server software that provides the infrastructure for enterprise instant messaging, presence, VoIP, ad hoc and structured conferences (audio, video and web conferencing) and PSTN connectivity through a third-party gateway or SIP trunk.

7. Called-party camp-on - Wikipedia

   en.wikipedia.org/wiki/Called-party_camp-on

   Called-party camp-on. In telecommunication, a called-party camp-on is a communication system service feature that enables the system to complete an access attempt in spite of issuance of a user blocking signal. This is most often found in a switchboard system at a company. Instead of going to voicemail or simply sitting on hold until the line ...