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    • 4. 发明申请
    • Communication system supporting two-way on-hold functionality
    • 支持双向保持功能的通信系统
    • US20060268858A1
    • 2006-11-30
    • US11141581
    • 2005-05-31
    • Anthony HagaleRyan RozichRhys UlerichPaul WilliamsonScott Winters
    • Anthony HagaleRyan RozichRhys UlerichPaul WilliamsonScott Winters
    • H04L12/56
    • H04M3/4286H04M7/006
    • A communication system and method include a first user agent initiating a telephone call to a second user agent. An intermediary agent establishes a first connection to the first user agent and a second connection to the second user agent. If the intermediary determines that the second user agent has placed the first user agent on hold, the intermediary terminates the first connection while maintaining the second connection on behalf of the first user agent. When the second user agent becomes available, it informs the intermediary. The intermediary then determines the availability of the first user agent. If the first user agent is available, it is connected to the second user agent. The agents preferably communicate over an IP network using session initiation protocol (SIP) compliant messages. The agents and the intermediary are configured to differentiate between a SIP message having a voice capable session description and a SIP message having an on-hold session description.
    • 通信系统和方法包括向第二用户代理发起电话呼叫的第一用户代理。 中间代理建立到第一用户代理的第一连接和到第二用户代理的第二连接。 如果中间人确定第二用户代理已经将第一用户代理置于保持状态,则中继终止代表第一用户代理维护第二连接的第一连接。 当第二个用户代理可用时,它通知中间人。 然后中介确定第一用户代理的可用性。 如果第一个用户代理可用,则它连接到第二个用户代理。 代理优选地通过使用会话发起协议(SIP)兼容消息的IP网络进行通信。 代理和中介被配置为区分具有语音能力的会话描述的SIP消息和具有保持会话描述的SIP消息。