歴史

VPIM (v1)

[1] RFC 1911 - Voice Profile for Internet Mail ( (2014-11-03 00:29:14 +09:00 版)) http://tools.ietf.org/html/rfc1911

VPIMv2

[2] RFC 2421 - Voice Profile for Internet Mail - version 2 (2014-08-04 01:19:09 +09:00 版) http://tools.ietf.org/html/rfc2421
[3] RFC 3801 - Voice Profile for Internet Mail - version 2 (VPIMv2) (2014-09-07 15:46:36 +09:00 版) http://tools.ietf.org/html/rfc3801

[4] RFC 2423 - VPIM Voice Message MIME Sub-type Registration, 2021-01-24T15:36:42.000Z, 2021-03-26T05:54:34.504Z https://tools.ietf.org/html/rfc2423

[5] rfc3804, 2021-06-11T05:33:25.000Z https://datatracker.ietf.org/doc/html/rfc3804