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Q.931
Last modified: Monday, February 28, 2005 

Q.931 is an ISDN connection control protocol, roughly comparable to TCP in the Internet protocol stack. Q.931 doesn't 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.

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For internet.com pages about Q.931 . Also check out the following links!

Related Links

Enterprise VoIP Planet 
The IT Manager's Guide to Voice over IP

ISDN Q.931 Call Control
OpenSS7 Integrated Services Digital Network provides an overview on Q.931 including documentation, implementation & more.

related categories

Internet Protocols

Internet Telephony

Standards

related terms

Internet Protocol

Internet telephony

ISDN

telephony

VoIP


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