| 摘要 |
An Internet Protocol Multimedia Subsystem, IMS, (109) comprises a network element (115), such as Session Border Controller, which implements a Back to Back User Agent (B2BUA). A remote station (101) implements a User Agent Client (UAC) (111) which can transmit Session Interface Protocol (SIP) session negotiation requests intended for a User Agent Server (UAS) (113). The B2BUA receives the SIP session negotiation requests and evaluates a negotiation frequency criterion. Only the SIP session negotiation requests for which the negotiation frequency criterion is met are forwarded to the UAS (113). |
