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2. Voice over LTE - Wikipedia

   en.wikipedia.org/wiki/Voice_over_LTE

   VoLTE calling. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1] [2] VoLTE has up to three times more voice [3] and data capacity than older 3G UMTS and up to six times more than 2G GSM.

3. List of SIP response codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_response_codes

   An intermediary machine or process rejected the call attempt. [25] This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard [26] with contact details. The calling party can ...

4. IP Multimedia Subsystem - Wikipedia

   en.wikipedia.org/wiki/IP_Multimedia_Subsystem

   The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched-style network, rather than strictly over an IP packet-switched network.

5. Video over LTE - Wikipedia

   en.wikipedia.org/wiki/Video_over_LTE

   ViLTE, an acronym for "Video over LTE", is a conversational (i.e. person to person) video service based on the IP Multimedia Subsystem (IMS) core network like VoLTE. It has specific profiles for the control and VoLTE of the video service and uses LTE as the radio access medium.

6. Enhanced 911 - Wikipedia

   en.wikipedia.org/wiki/Enhanced_911

   Calls made to non-911 emergency numbers (such as the direct line to a police or fire department) might not have automatic location enabled. Calls to 911 are answered by an operator at a PSAP. In addition to the voice transmission, the telephone network also transmits a number associated with the current call, the ANI.

7. Next Generation 911 - Wikipedia

   en.wikipedia.org/wiki/Next_generation_911

   In the Next Generation 911 environment, the public will be able to make voice, text, or video emergency "calls" from any communications device via Internet Protocol-based networks. The PSAP of the future will also be able to receive data from personal safety devices such as Advanced Automatic Collision Notification systems, medical alert ...