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3514 The Security Flag in the IPv4 Header. S. Bellovin. April 1 2003.(Format: TXT=11211 bytes) (Status: INFORMATIONAL)3515 The Session Initiation Protocol (SIP) Refer Method. R. Sparks.April 2003. (Format: TXT=47788 bytes) (Status: PROPOSED STANDARD)3516 IMAP4 Binary Content Extension. L. Nerenberg. April 2003.(Format: TXT=14598 bytes) (Updated by RFC4466) (Status: PROPOSEDSTANDARD)3517 A Conservative Selective Acknowledgment (SACK)-based LossRecovery Algorithm for TCP. E. Blanton, M. Allman, K. Fall, L. Wang.April 2003. (Format: TXT=27855 bytes) (Status: PROPOSED STANDARD)3518 Point-to-Point Protocol (PPP) Bridging Control Protocol (BCP). M.Higashiyama, F. Baker, T. Liao. April 2003. (Format: TXT=82102 bytes)(Obsoletes RFC2878) (Status: PROPOSED STANDARD)3519 Mobile IP Traversal of Network Address Translation (NAT) Devices.H. Levkowetz, S. Vaarala. April 2003. (Format: TXT=80522 bytes)(Status: PROPOSED STANDARD)3520 Session Authorization Policy Element. L-N. Hamer, B. Gage, B.Kosinski, H. Shieh. April 2003. (Format: TXT=63445 bytes) (Status:PROPOSED STANDARD)3521 Framework for Session Set-up with Media Authorization. L-N.Hamer, B. Gage, H. Shieh. April 2003. (Format: TXT=59548 bytes)(Status: INFORMATIONAL)3522 The Eifel Detection Algorithm for TCP. R. Ludwig, M. Meyer. April2003. (Format: TXT=33731 bytes) (Status: EXPERIMENTAL)