# Requirements Archive: v1.2 Extended Protocol Coverage

**Archived:** 2026-03-27
**Status:** SHIPPED

For current requirements, see `.planning/REQUIREMENTS.md`.

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# Requirements: NetSynth

**Defined:** 2026-03-27
**Core Value:** Network traffic patterns are instantly recognizable as distinct sounds — a ping sounds different from HTTPS noise, which sounds different from a port scan.

## v1.2 Requirements

Requirements for extended protocol coverage milestone. Each maps to roadmap phases.

### Cleanup

- [x] **CLEAN-01**: Remove stale `NumLayers` constant and hardcoded frequency range test assertions that would block new class additions

### Protocol Coverage

- [x] **PROTO-01**: Add Mail family protocols: IMAP (143/993), POP3 (110/995), SMTP-submission (587)
- [x] **PROTO-02**: Add File Transfer family protocols: FTP (20-21), SMB/CIFS (445), TFTP (69)
- [x] **PROTO-03**: Add Remote Access family protocols: RDP (3389), Telnet (23), VNC (5900)
- [x] **PROTO-04**: Add Database family protocols: MySQL (3306), PostgreSQL (5432), Redis (6379), MongoDB (27017)
- [x] **PROTO-05**: Add Discovery family protocols: mDNS (5353), SSDP/UPnP (1900), SNMP (161-162)
- [x] **PROTO-06**: Add VoIP family: SIP (5060/5061)
- [x] **PROTO-07**: Add Web family extension: QUIC/HTTP3 (UDP 443)
- [x] **PROTO-08**: Add Infrastructure family protocols: LDAP (389/636), Kerberos (88), Syslog (514)
- [x] **PROTO-09**: Existing 10 protocol classifications remain unchanged — no regression in rule matching behavior

### Frequency Design

- [ ] **FREQ-01**: All traffic classes (existing + new) are redistributed into group-coherent frequency bands using musical interval ratios (not fixed Hz steps)
- [ ] **FREQ-02**: Within-family protocols are separated by at least a major second interval (ratio 1.122) to avoid critical band masking
- [ ] **FREQ-03**: The full frequency allocation table is designed and documented before any FreqConfig code is written
- [x] **FREQ-04**: Auto-assign frequency range for user custom classes is updated to avoid collision with new built-in frequencies

### Group System

- [ ] **GRP-01**: Each traffic class belongs to a named group (Infrastructure, Web, Mail, File Transfer, Remote Access, Database, Discovery, VoIP)
- [x] **GRP-02**: `--print-config` output organizes classes by group with section headers
- [x] **GRP-03**: Users can define `[groups]` in TOML config to reassign protocols to different sound families
- [ ] **GRP-04**: FreqConfig gains a `Group` field that drives group-aware frequency allocation and config output

## Future Requirements

Deferred to later releases.

### Dynamic Protocol Detection

- **DYN-01**: RTP voice/video payload detection (dynamically negotiated ports — cannot use port-based rules)
- **DYN-02**: Application-layer protocol detection via DPI for ambiguous ports

### Audio Tuning

- **TUNE-01**: User can configure time window duration via `--window` flag
- **TUNE-02**: User can configure output duration when reading pcap files via `--duration` flag

## Out of Scope

| Feature | Reason |
|---------|--------|
| RTP payload detection | Dynamically negotiated ports; needs DPI, not port rules |
| mDNS multicast group join | Would require raw socket changes; port 5353 classification is sufficient |
| Protocol-specific metadata extraction | Beyond classification scope; tool sonifies, not inspects |
| Real-time audio playback | File output only — established v1.0 constraint |
| GUI config editor | CLI-only tool; TOML is human-editable |

## Traceability

Which phases cover which requirements. Updated during roadmap creation.

| Requirement | Phase | Status |
|-------------|-------|--------|
| CLEAN-01 | Phase 8 | Complete |
| FREQ-01 | Phase 9 | Pending |
| FREQ-02 | Phase 9 | Pending |
| FREQ-03 | Phase 9 | Pending |
| FREQ-04 | Phase 9 | Complete |
| GRP-01 | Phase 9 | Pending |
| GRP-04 | Phase 9 | Pending |
| PROTO-01 | Phase 10 | Complete |
| PROTO-02 | Phase 10 | Complete |
| PROTO-03 | Phase 10 | Complete |
| PROTO-04 | Phase 10 | Complete |
| PROTO-05 | Phase 10 | Complete |
| PROTO-06 | Phase 10 | Complete |
| PROTO-07 | Phase 10 | Complete |
| PROTO-08 | Phase 10 | Complete |
| PROTO-09 | Phase 10 | Complete |
| GRP-02 | Phase 11 | Complete |
| GRP-03 | Phase 11 | Complete |

**Coverage:**
- v1.2 requirements: 18 total
- Mapped to phases: 18 (complete)
- Unmapped: 0

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*Requirements defined: 2026-03-27*
*Last updated: 2026-03-27 — traceability complete, roadmap phases 8-11 assigned*