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Definition - What does Q.931 mean?

Q.931 is an Integrated Services Digital Network (ISDN) signal connection control protocol that is an International Telecommunication Union (ITU)-T Recommendation.

Techopedia explains Q.931

Q.931 and TCP/IP work at different layers and share few features. Q.931 has reliable layers but does not provide retransmission or flow control. Q.931 frame elements are as follows:

  • Protocol discriminator (PD): Specifies connection signaling protocol.
  • Call reference value (CR): Addresses concurrent connections.
  • Message type (MT): Specifies three-message layer type (i.e., call setup, release and feature control) from Q.931 call control message set.
  • Information elements (IE): Specifies additional message details, that is, name, length and variable content field.

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