Third Party Control Protocol (TPCP) is a client-server protocol with three types of primitives:
- Request (used by the client),
- Notify (used by the server to send state information to the client),
- Responses (sent as a response to a request)
TPCP is the Protocol used for third party call control 3pcc. TPCP is the protocol used by the controller while communicating with the control server over the control let[clarification needed]. TPCP is used to initiate, control and observe sessions between remote parties.
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