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auto-ingest: ietf-elements backfill — 186 new elements (2026-07-06)
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document: rfc-8817
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kind: design-rationale
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summary: The number of frames in an RTP packet is not transmitted explicitly; the receiver determines frame count by identifying each frame type and length from the rate code bits, then summing octets across the packet. This avoids a redundant count field.
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section: "3.3"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: design-rationale
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summary: The preferred TSVCIS packing format uses MTC = TC − 15 (minimum parameter set is 15 octets) to extend the 6-bit MTC field's effective range to 77 octets; the alternate two-trailing-byte format accommodates all other NRL VDR configurations without an upper bound.
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section: "3.2"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: design-rationale
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summary: 'TSVCIS is designed as an augmentation to MELPe rather than a standalone codec: a complete TSVCIS speech frame always pairs TSVCIS augmented data with temporally matched MELPe 2400 bps parameters, enabling graceful fallback to MELPe alone on severely bandwidth-constrained links.'
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section: "2"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: interoperability-note
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summary: CODB for MELPe 600 bps MAY deviate from Table 1 when bit 55 is used as an alternating 1/0 end-to-end framing bit; frame decoding remains distinct because CODA=0 alone identifies a 7-byte frame, and 600 bps can be deduced from the RTP timestamp and SDP negotiation.
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section: "3.1"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: interoperability-note
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summary: The SDP 'ptime' parameter cannot be used to specify the TSVCIS operating mode because certain values are ambiguous; for example, ptime=68 cannot distinguish one 67.5 ms frame from three 22.5 ms frames.
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section: "4.2"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: interoperability-note
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summary: TSVCIS RTP packetization of MELPe follows RFC 8130, with RFC 8130 recommendations now treated as requirements. The bits previously labeled RSVA, RSVB, RSVC in RFC 8130 SHOULD be filled with rate code bits CODA, CODB, CODC as defined in Table 1.
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section: "3.1"
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: normative-requirement
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summary: Any unfilled bits in the last octet of a byte-packed TSVCIS parameter field MUST be filled with zero. Parameters may be split between octets with the most significant bits in the earlier octet.
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section: "2"
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rfc2119_level: MUST
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topics:
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- rtp
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: normative-requirement
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summary: Applications using RTP over UDP SHOULD implement their own congestion control above the UDP layer per RFC 8085, and MAY also implement a transport circuit breaker per RFC 8083. TSVCIS supports congestion management by adjusting the target bitrate or frames per packet.
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section: "3.4"
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rfc2119_level: SHOULD
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topics:
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- rtp
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- congestion
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- udp
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: normative-requirement
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summary: Frames MUST NOT be split between RTP packets. All MELPe frames within a single RTP packet MUST be of the same coder bitrate.
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section: "3.3"
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rfc2119_level: MUST
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"
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document: rfc-8817
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kind: normative-requirement
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summary: If the 'bitrate' parameter is absent from the SDP fmtp attribute, the fixed MELPe coder bitrate of 2400 bps MUST be used.
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section: "4.1"
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rfc2119_level: MUST
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topics:
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- rtp
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- realtime
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extracted_by: claude-sonnet-4-6
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extracted_at: "2026-07-06"

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