Q series 
Q series
Telecom Definition
The series of ITU-T Recommendations specifying protocols relating to switching and signaling. See Table Q-1 of selected Q-series Recommendations. For a full listing of ITU-T Recommendations, see the contact information in Appendix A.
Table Q-1: Selected ITU-T Q-Series Recommendations
| Recommendation | Description |
|---|---|
| Q.20 | Comparative advantages of in-band and out-of-band signaling systems |
| Q.21 | Systems recommended for out-band signaling |
| Q.22 | Frequencies to be used for in-band signaling |
| Q.23 | Technical features of push-button telephone sets |
| Q.71 | ISDN circuit mode switched bearer services |
| Q.700 | Introduction to CCITT Signaling System No. 7 (SS7) |
| Q.716 | SS7 - Signaling connection control part (SCCP) performance |
| Q.721 | Functional description of SS7Telephone User Part (TUP) |
| Q.824.1 | ISDN basic and primary rate access |
| Q.824.2 | ISDN supplementary services |
| Q.824.3 | ISDN optional user facilities |
| Q.824.4 | ISDN teleservices |
| Q.921 | ISDN user-network interface - Data link layer specification |
| Q.931 | ISDN user-network interface layer 3 specification for basic call control |
| Q.2763 | SS7 B-ISDN User Part (B-ISUP) - Formats and codes |
| Q.2764 | SS7 B-ISDN User Part (B-ISUP) - Basic call procedures |
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