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Q.931

:
An ITU-T standard describing the ISDN's call signaling protocol (a.k.a D-channel protocol).

Several Q.931 derivates or subsets are used, namely the Digital Subscriber Signalling System No. 1 (DSS1, more commonly known as Euro-ISDN) and QSIG. Also, the first widely adopted VoIP protocol H.323 (more precisely, its call control part H.225) is based on Q.931.

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