(registered by RFC3558) Media Type Name: audio Media Subtype Name: SMV Required Parameter: none Optional parameters: The following parameters apply to RTP transfer only. ptime: Defined as usual for RTP audio (see RFC 2327). maxptime: The maximum amount of media which can be encapsulated in each packet, expressed as time in milliseconds. The time SHALL be calculated as the sum of the time the media present in the packet represents. The time SHOULD be a multiple of the duration of a single codec data frame (20 msec). If not signaled, the default maxptime value SHALL be 200 milliseconds. maxinterleave: Maximum number for interleaving length (field LLL in the Interleaving Octet). The interleaving lengths used in the entire session MUST NOT exceed this maximum value. If not signaled, the maxinterleave length SHALL be 5. Encoding considerations: This type is defined for transfer of SMV-encoded data via RTP using the Interleaved/Bundled packet format specified in Section 4.1, 6, and 7 of RFC 3558. It is also defined for other transfer methods using the storage format specified in Section 11 of RFC 3558. Security considerations: See Section 14 "Security Considerations" of RFC 3558. Public specification: The SMV vocoder is specified in 3GPP2 C.S0030-0 v2.0. Transfer methods are specified in RFC 3558. Additional information: The following information applies to storage format only. Magic number: #!SMV\n (see Section 11 of RFC 3558) File extensions: smv, SMV Macintosh file type code: none Object identifier or OID: none Intended usage: COMMON. It is expected that many VoIP applications (as well as mobile applications) will use this type. Person & email address to contact for further information: Adam Li adamli&icsl.ucla.edu Author/Change controller: Adam Li adamli&icsl.ucla.edu IETF Audio/Video Transport Working Group