2. Modem command set: TIA-602, "Hayes compatible"
| Required |
3. Data modem: 28.8 Kbps (V.34-1994) with V.42 and V.42bis protocol
| Required |
4. Synchronous access for data modems: V.80 or similar technique
| Recommended |
5. Fax modem: 14.4 Kbps (V.17) with Class 1 (TIA-578-A) command set
| Required |
6. Telephone Device for the Deaf (TDD): V.18 with V.25ter command
| Recommended |
Voice and Adaptive Connection Technologies for Modems
7. TIA-695 (AT+V); Speakerphone, if voice modem capabilities
| Recommended | Recommended | Required |
8. Voice-coding: real-time wave encoder/decoder
| Recommended |
9. Adaptive connection support, V.25, V.8, and V.8bis call control signaling, with V.25ter Annex A modem commands
| Recommended |
10. Support existing CPE, local telset, extension off-hook detection, and loop sensing, if voice modem capabilities present
| Recommended |
11. Simultaneous voice/data integration capabilities
| Recommended |
12. VoiceView as alternating voice/data integration capabilities
| Optional |
CLASS Services and Other Features for Modems
13. Distinctive ringing class service
| Recommended |
14. Caller ID service
| Recommended |
15. Dial string modifiers for DTE-DCE commands
| Recommended |
16. In-band Voice Mode (AT+V) responses for DTE-DCE commands
| Recommended |
17. Compound Voice Mode (AT+V) responses for DTE-DCE commands
| Recommended |
18. Telephone wave device compression method selection
| Recommended |
19. Cellular phone support
| Recommended |
20. Support for blacklisted and delayed number clearing
| Recommended |