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To create a session, you use the IRTCClient::CreateSession method. To activate the session, you use the IRTCSession::AddParticipant method. A session is initiated via the SIP proxy server if the URL entered in IRTCSession::AddParticipant is e-mail or a telephone number. If the IP address or machine name is entered, a direct communication link is set up and the SIP proxy is not required. For a complete list of the requirements for a SIP session, see the Server Requirements section. For general session information, see General Requirements.
| Session type | Definition |
|---|---|
| PC-PC | An audio, video, or both audio and video communication between two computers. |
| PC-phone | An audio communication initiated from a computer to a PSTN device. |
| Phone-phone | An audio call between two or more PSTN devices. |
| IM | A session that allows two participants to communicate through real-time text-based messages. |
| MIM | A session that allows two or more participants to communicate through real-time text-based messages. |
| Application | The application handles the session negotiations for the session. |