| 摘要 |
A method of exchanging Session Initiation Protocol (SIP) options messages for Rich Communication Suite (RCS) capability discovery in a portable terminal is provided. The method includes requesting a server for a setting value associated with an SIP options message exchange, receiving the setting value including the number of the SIP options messages for transmission and a transmission cycle of the SIP options message, transmitting the SIP options message to each of as many contacts as the number of the SIP options messages in the transmission cycle, receiving a reply message from each of the contacts to which the SIP options message is sent, and updating RCS capability information of the contact according to the received reply message, the contacts are registered to a phone book of the portable terminal.
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