An International Telecommunication Union Specification for establishing, maintaining, and clearing Integrated Services Digital Network (ISDN) connections. See ISDN.
Q.931 A well know ITU-T standard for access signalling between an ISDN terminal and narrow band ISDN network.
ITU that Describes the Layer 3 signaling procedure protocol stack to setup ISDN connections. Primarily used for basic and primary rate interfaces
An ITU standard that describes ISDN signaling. The H.225.0 standard uses a variant of Q.931 to establish and disconnect H.323 sessions.
ITU-T Recommendation for ISDN user-network signalling. ISDN user-network interface layer 3 specification for basic call control. http://www.itu.int/rec/recommendation.asp?type=folders&lang=e&parent=T-REC-Q.931
ISDN connection control protocol, roughly comparable to TCP in the Internet protocol stack. Q.931 doesnt provide flow control or perform retransmission, because the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbps. Q.931 does manage connection setup and breakdown. In H.323 scenario, this protocol is encapsulated in TCP and sent to port 1720.
Call signaling protocol as defined by the ITU-T which is used for call setup and tear down.
This is the network layer protocol for ISDN. Q.931 was developed for out of band call control.
A protocol for Call Signaling, consisting of Setup, Teardown and Disengage. Q.931 is included in the H.225.0 Recommendation.
CCITT recommendation Q.931 describes an ISDN protocol for the network layer (layer 3 in the OSI layering model). See also network layer, OSI.
Call signaling protocol for setup and termination of calls
ITU-T Recommendation Q.931 is ISDN's connection control protocol, roughly comparable to TCP in the Internet Protocol stack. Q.931 doesn't provide flow control or perform retransmission, since the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbit/s. Q.931 does manage connection setup and breakdown.