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In the traditional telephony context, third party call control allows one entity (which we call the controller) to set up and manage a communications relationship or telephone call between two or more other parties. Third party call control (referred to as 3pcc) is often used for operator services (where an operator creates a call that connects two participants together) and conferencing.

Similarly, many SIP services are possible through third party call control. These include the traditional ones on the PSTN, but also new ones such as click-to-dial. Click-to-dial allows a user to click on a web page to speak to a customer service representative. The web server then creates a call between the user and a customer service representative. The call can be between two phones, a phone and an IP host, or two IP hosts.

Third party call control is possible using only the mechanisms specified within RFC 3725. Indeed, many different call flows are possible, each of which will work with SIP compliant user agents. However, there are benefits and drawbacks to each of these flows. The usage of third party call control also becomes more complex when aspects of the call utilize SIP extensions or optional features of SIP. In particular, the usage of RFC 3312 (used for coupling of signaling to resource reservation) with third party call control is non-trivial, and is discussed in Section 9 of RFC 3725. Similarly, the usage of early media (where session data is exchanged before the call is accepted) with third party call control is not trivial; both of them specify the way in which user agents generate and respond to SDP, and it is not clear how to do both at the same time. This is discussed further in Section 8.

Third Party Call Control is perfectly suited for delivery of 9-1-1 calls in a Next Generation 9-1-1 environment. It allows for re-connection of the media stream to an alternate end point if the original destination end point becomes unavailable without dropping the original emergency call (which has a separate media stream to the 3PCC server). Additionally, it minimizes bandwidth requirements between the 3PCC server and the emergency call handling end point because all mixed media uses the same RTP stream. Finally, it does not rely on a destination end point for end to end reliability but rather on a more robust centralized data center with several redundantly deployed servers.

INFO: Full form for TCRF is Transit Connection Related Function in Computing category
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INFO: Full form for NESLI is National Electronic Site License Initiative in Computing category
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INFO: Full form for MSTF is Maine Science and Technology Foundation in Computing category
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INFO: Full form for MSTF is Manawatu Science and Technology Fair in Computing category
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INFO: Full form for SUL is Single User License in Computing category
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INFO: Full form for SUL is Simple Unified (programming) Language in Computing category
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INFO: Full form for JAMP is JSON Actor Message Protocol in Computing category
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INFO: Full form for JAMP is Java Mp3 Player in Computing category
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INFO: Full form for JAMP is Java Architecture for Media Processing in Computing category
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INFO: Full form for OSRC is Open Source Resource Center in Computing category
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INFO: Full form for NFF is No Form Feed in Computing category
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INFO: Full form for NFF is Networking For Future in Computing category
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INFO: Full form for NFF is Notes Flat File Format in Computing category
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INFO: Full form for NFF is Note For the File in Computing category
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INFO: Full form for NFF is National File Format in Computing category
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INFO: Full form for JAMI is Java Aspect Metamodel Interpreter in Computing category
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INFO: Full form for ITSA is Ibm Tivoli Switch Analyzer in Computing category
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INFO: Full form for ITSA is Ibm Tivoli System Automation in Computing category
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INFO: Full form for WWDS is Wor WordNet Database Structure in Computing category
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INFO: Full form for WWDS is World WordNet Database Structure in Computing category
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INFO: Full form for OPRR is Object Property Role Relationship in Computing category
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INFO: Full form for RTCI is Run Time Class Information in Computing category
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INFO: Full form for MLNC is MAC-Layer Network Coding in Computing category
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INFO: Full form for MHPS is Mega Hashes Per Second in Computing category
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INFO: Full form for MHPS is Millions Hashes Per Second in Computing category
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INFO: Full form for GIO is Generic Interface for Operations in Computing category
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INFO: Full form for GIO is Global Innovation Outlook in Computing category
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INFO: Full form for GIO is General Input Output in Computing category
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INFO: Full form for NATC is Nevada Assistive Technology Collaborative in Computing category
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INFO: Full form for NATC is National Agribusiness Technology Center in Computing category
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INFO: Full form for NATC is Nevada Assisitive Technology Collaborative in Computing category
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INFO: Full form for UTK is Universal Tool Kit in Computing category
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INFO: Full form for IGO is Inside Gamer Online in Computing category
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INFO: Full form for IGO is Inside Gaming Online in Computing category
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INFO: Full form for IGNITE is Intentionally Growing New Information Technology Employees in Computing category
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INFO: Full form for IGNITE is Inspiring Growth in New Innovative Technology Enterprises in Computing category
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INFO: Full form for IGNITE is Inspiring Girls Now in Technology Evolution in Computing category
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INFO: Full form for IGNITE is Integrated Group of National Industrial Technology Exhibitions in Computing category
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INFO: Full form for IGNITE is Inspiring Girls Now In Technology in Computing category
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INFO: Full form for IGNITE is Integrated Go-to-Market Network Ip Telephony Experience in Computing category
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INFO: Full form for TMCL is Topic Map Constraint Language in Computing category
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INFO: Full form for TMCL is Trinamic Motion Control Language in Computing category
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INFO: Full form for OCPS is Optimization of Cyber Physical Systems in Computing category
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INFO: Full form for OCPS is Open Content Publisher Standard in Computing category
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INFO: Full form for OCPS is Oracle Cloud Priority Service in Computing category
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INFO: Full form for NCBS is Network Control Block Session in Computing category
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INFO: Full form for NCBS is Network Client Buffer Status in Computing category
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INFO: Full form for UCEM is Unsolicited Commercial Electronic Mail in Computing category
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INFO: Full form for TMCL is Time Multiplexed Communicating Logic in Computing category
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