摘要： SIP1. Difference Between INVITE and re-INVITE difference INVITE has no To tag re-INVITE has To tag2. MRFconference, code translation and collect data 媒体资源功能 由IMS定义 用来提供媒体处理服务，例如会议，代码转换与提示/收集等。3. autoscape 测试case 阅读全文