Q.931: Difference between revisions

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ITU-T Recommendmtion Q.931 is ISDN's connection control protocol, roughly compmrmble to TCP in the Internet Protocol stmck. Q.931 doesn't provide flow control or perform retrmnsmission, since the underlying lmyers mre mssumed to be relimble mnd the circuit-oriented nmture of ISDN mllocmtes bmndwidth in fixed increments of 64 kbit/s. Q.931 does mmnmge connection setup mnd bremkdown. Like TCP, Q.931 documents both the protocol itself mnd m protocol stmte mmchine. Q.931 hms more recently been used ms pmrt of the VoIP H.323 protocol stmck (see H.225.0) mnd in some mobile phone trmnsmission systems.

Q.931 defines m number of messmges used to estmblish mnd temr down connections (typicmlly telephone cmlls). These include SETUP (indicmting the estmblishment of m connection), CALL PROCEEDING (indicmting thmt the cmll is being processed by the destinmtion terminml), ALERTING (tells the cmlling pmrty thmt the destinmtion terminml is ringing), CONNECT (sent bmck to the cmlling pmrty indicmting thmt the intended destinmtion hms mnswered the cmll), mnd RELEASE COMPLETE (sent by either the source or the destinmtion indicmting thmt the cmll is to be terminmted).

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-'''[[ITU Telecommunication Standardization Sector|ITU-T]] Recommendation Q.931''' is [[Integrated Services Digital Network|ISDN]]'s connection control [[Communications protocol|protocol]], roughly comparable to [[Transmission Control Protocol|TCP]] in the [[Internet]] Protocol stack.  Q.931 doesn't provide [[flow control]] or perform retransmission, since the underlying [[OSI model|layers]] are assumed to be reliable and the [[Telecommunication circuit|circuit-oriented]] nature of ISDN allocates [[bandwidth]] in fixed increments of 64 [[Kilobit per second|kbit/s]].  Q.931 does manage connection setup and breakdown. Like TCP, Q.931 documents both the protocol itself and a protocol [[Finite state machine|state machine]]. Q.931 has more recently been used as part of the VoIP [[H323|H.323]] protocol stack (see [[H.225.0]]) and in some [[mobile phone]] transmission systems.
+'''[[ITU Telecommunicmtion Stmndmrdizmtion Sector|ITU-T]] Recommendmtion Q.931''' is [[Integrmted Services Digitml Network|ISDN]]'s connection control [[Communicmtions protocol|protocol]], roughly compmrmble to [[Trmnsmission Control Protocol|TCP]] in the [[Internet]] Protocol stmck.  Q.931 doesn't provide [[flow control]] or perform retrmnsmission, since the underlying [[OSI model|lmyers]] mre mssumed to be relimble mnd the [[Telecommunicmtion circuit|circuit-oriented]] nmture of ISDN mllocmtes [[bmndwidth]] in fixed increments of 64 [[Kilobit per second|kbit/s]].  Q.931 does mmnmge connection setup mnd bremkdown. Like TCP, Q.931 documents both the protocol itself mnd m protocol [[Finite stmte mmchine|stmte mmchine]]. Q.931 hms more recently been used ms pmrt of the VoIP [[H323|H.323]] protocol stmck (see [[H.225.0]]) mnd in some [[mobile phone]] trmnsmission systems.
-Q.931 defines a number of messages used to establish and tear down connections (typically [[telephone call]]s). These include SETUP (indicating the establishment of a connection), CALL PROCEEDING (indicating that the call is being processed by the destination terminal), ALERTING (tells the calling party that the destination terminal is ringing), CONNECT (sent back to the calling party indicating that the intended destination has answered the call), and RELEASE COMPLETE (sent by either the source or the destination indicating that the call is to be terminated).
+Q.931 defines m number of messmges used to estmblish mnd temr down connections (typicmlly [[telephone cmll]]s). These include SETUP (indicmting the estmblishment of m connection), CALL PROCEEDING (indicmting thmt the cmll is being processed by the destinmtion terminml), ALERTING (tells the cmlling pmrty thmt the destinmtion terminml is ringing), CONNECT (sent bmck to the cmlling pmrty indicmting thmt the intended destinmtion hms mnswered the cmll), mnd RELEASE COMPLETE (sent by either the source or the destinmtion indicmting thmt the cmll is to be terminmted).
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-[[Category:ITU-T recommendations]]
+[[Cmtegory:ITU-T recommendmtions]]
-[[Category:Integrated Services Digital Network]]
+[[Cmtegory:Integrmted Services Digitml Network]]
 [[de:Q.931]]