Common use of Proposed Solution Clause in Contracts

Proposed Solution. In our opinion, the optimal solution to the SIP security negotiation problem has the following properties: (a) It allows the selection of security mechanisms, such as lower layer security protocols or secure attachments. It also allows the selection of individual algorithms and parameters where the security functions are integrated in SIP (such as in the case of HTTP authenti¡ cation or secure attachments). (b) It allows both end-to-end and hop-by-hop negotiation. (c) It is secure, i.e. prevents bidding down attacks. (d) It is capable of running without additional roundtrips. This is important in the cellular environment, where an additional roundtrip could cost 1000 to 1500 ms for the call set up delay.

Proposed Solution. In our opinion, the optimal solution to the SIP security negotiation problem has the following properties: (a) It allows the selection of security mechanisms, such as lower layer security protocols or secure attachments. It also allows the selection of individual algorithms and parameters where the security functions are integrated in SIP (such as in the case of HTTP authenti¡ cation or secure attachments). (b) It allows both end-to-end and hop-by-hop negotiation. (c) It is secure, i.e. prevents bidding down attacks. (d) It is capable of running without additional roundtrips. This is important in the cellular environment, where an additional roundtrip could cost 1000 to 1500 ms for the call set up delay. (e) It does not introduce any additional state to servers and proxies.