Q.931
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ITU-T Recommendation Q.931 is the ITU standard ISDN connection control signalling protocol, forming part of Digital Subscriber Signalling System No. 1. Unlike connectionless systems like UDP, ISDN is connection oriented and uses explicit signalling to manage call state: Q.931. Q.931 typically does not carry user data. Q.931 does not have a direct equivalent in the Internet Protocol stack, but can
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| Q.931 | |
|---|---|
| ISDN user-network interface layer 3 specification for basic call control | |
 | |
| Status | In force |
| Year started | 1988 |
| Latest version | (05/98) May 1998 |
| Organization | ITU-T |
| Related standards | H.323 |
| Website | https://www.itu.int/rec/T-REC-Q.931 |
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