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2421 Voice Profile for Internet Mail - version 2. G. Vaudreuil, G.Parsons. September 1998. (Format: TXT=123663 bytes) (ObsoletesRFC1911) (Obsoleted by RFC3801) (Status: PROPOSED STANDARD)2422 Toll Quality Voice - 32 kbit/s ADPCM MIME Sub-type Registration.G. Vaudreuil, G. Parsons. September 1998. (Format: TXT=10157 bytes)(Obsoletes RFC1911) (Obsoleted by RFC3802) (Status: PROPOSEDSTANDARD)2423 VPIM Voice Message MIME Sub-type Registration. G. Vaudreuil, G.Parsons. September 1998. (Format: TXT=10729 bytes) (ObsoletesRFC1911) (Obsoleted by RFC3801) (Status: PROPOSED STANDARD)2424 Content Duration MIME Header Definition. G. Vaudreuil, G.Parsons. September 1998. (Format: TXT=7116 bytes) (Obsoleted byRFC3803) (Status: PROPOSED STANDARD)2425 A MIME Content-Type for Directory Information. T. Howes, M.Smith, F. Dawson. September 1998. (Format: TXT=64478 bytes) (Status:PROPOSED STANDARD)2426 vCard MIME Directory Profile. F. Dawson, T. Howes. September1998. (Format: TXT=74646 bytes) (Status: PROPOSED STANDARD)2427 Multiprotocol Interconnect over Frame Relay. C. Brown, A. Malis.September 1998. (Format: TXT=74671 bytes) (Obsoletes RFC1490,RFC1294) (Also STD0055) (Status: STANDARD)2428 FTP Extensions for IPv6 and NATs. M. Allman, S. Ostermann, C.Metz. September 1998. (Format: TXT=16028 bytes) (Status: PROPOSEDSTANDARD)