Appendix I (to Recommendation Q.931) Usage of cause values Table I-2/Q.931 indicates the usage of cause values within Recommendation Q.931. Other usage may be provided within other Recommendations, e.g. Q.700-Series and Q.699. Other causes may also be used by Q.931 entities where this is not precluded by the procedures defined elsewhere in Q.931. Table I-1/Q.931 defines the key for the location of generation in Table I-2/Q.931. For more precise usage of the location codes in the cause information element, see Annex J/Q.931. TABLE I-1/Q.931 Key for the location of the generation in Table I-2/Q.931 LU : Local user LN : Local network TN : Transit network RN : Remote network RU : Remote user LPE: Local peer entity (for symmetrical operation, see Annex D/Q.931) The following abbreviations to message types are used in Table I-2/Q.931. CON CON CONGESTION CONTROL DISC DISCONNECT REL RELEASE REL COM RELEASE COMPLETE RES REJ RESUME REJECT STAT STATUS SUSP REJ SUSPEND REJECT TABLE I-2/Q.931 (1 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference � of � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �1 � 000 � 0001 쿢nassigned 쿎ondition �5.1.4 쿗N � 쿝EL COM � � � � �(unallocated) � � � � 쿏ISC � � � � 쿻umber � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.2.4 쿝U 쿝EL COM � � � � � � � � � 쿏ISC � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �2 � 000 � 0010 쿙o route to 쿟ransit 쿎.2 쿟N � 쿏ISC � � � � 퀂pecified transit 쿻etwork 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � 쿻etwork 쿶dentity/ 쿐.3 쿗N � 쿝EL COM � � � � � 쿻etwork � � � � � � � � � 퀂pecific � � � � � � � � � 쿯acilities � � � � � � � � � 쿶nfo. � � � � � � � � � 쿮lements � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �3 � 000 � 0011 쿙o route to 쿎ondition �5.1.4 쿗N � 쿏ISC � � � � 쿭estination � � � � 쿝EL COM � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.2.4 쿝U 쿝EL COM 쿏ISC � � � � � � � � 쿏ISC � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (2 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �6 � 000 � 0110 쿎hannel � - �5.2.3.1c 쿗N � 쿝EL � � � � 퀅nacceptable � �5.3.2.d � � � � � � � � � �6.2.2.3.1 � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �7 � 000 � 0111 쿎all awarded and � - �6.2.2.3.1 쿗N � 쿝EL � � � � 쿫eing delivered in� � � � � � � � � 쿪n established � � � � � � � � � 쿬hannel � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �16 � 001 � 0000 쿙ormal call 쿎ondition � 쿝U 쿏ISC 쿏ISC � � � � 쿬learing � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �17 � 001 � 0001 쿢ser busy � - �5.2.5.1 쿝U 쿝EL COM. � � � � � � � �5.2.5.4b � � 쿏ISC � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � 쿙o procedure쿝N � 쿏ISC � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �18 � 001 � 0010 쿙o user responding� - �5.2.5.3 쿝N � 쿏ISC � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �19 � 001 � 0011 쿢ser alerting, � - �5.2.5.3 쿝N � 쿏ISC � � � � 쿙o answer � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �21 � 001 � 0101 쿎all rejected 쿎ondition: �5.2.5.1 쿝U 쿝EL COM. 쿏ISC � � � � � 퀅ser supplied�5.2.5.4b � � � � � � � � 쿭iagnostic � � � � � � � � � � � � � � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (3 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �22 � 001 � 0110 쿙umber changed 쿙ew �5.1.4 쿗N � 쿏ISC � � � � � 쿭estination � � � 쿝EL COM � � � � � 쿻umber 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.2.4 쿝U 쿝EL COM 쿏ISC � � � � � � � � 쿏ISC � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �26 � 001 � 1010 쿙on-selected user � - �5.3.2b 쿗N � 쿝EL � � � � 쿬learing � �6.2.2.3.1 � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �27 � 001 � 1011 쿏estination out � - �5.8.9 쿝N � 쿏ISC � � � � 쿽f order � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �28 � 001 � 1100 쿔nvalid number � - � 쿗ocal � 쿝ELease +� � � � 쿯ormat � � 쿻etwork � 쿏ISC � � � � �(incomplete � � � � 쿎OMPlete � � � � 쿻umber) � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.2.4 쿝U 쿏ISC 쿏ISC � � � � � � � � 쿝EL COM � � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.1.5.2 쿗N � 쿏ISC � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.2.4 쿝N � 쿏ISC � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.1.4 쿗N � 쿏ISC � � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �29 � 011 � 1101 쿑acility rejected 쿑acility 쿙o 쿗N � 쿝EL COM � � � � � 쿶dentifi- 쿾rocedure in� � 쿏ISC � � � � � 쿬ation 쿶n Q.931 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � � 쿝N � 쿏ISC � � � � � � � 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � � 쿝U � REL COM � � � � � � � � � � DISC � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (4 of 11) Usage of cause values 旼컴컴쩡컴컴컴쩡컴컴컴쩡컴컴컴컴컴컴컴컴컫컴컴컴컴컴컫컴컴컴컴컴컴쩡컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴커 � � � � � � � � Typical carrying � 쿎ause� Class � Value � Cause name 쿏iagnostics� Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴컴쩡컴컴컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface � 쳐컴컴탠컴컴컴탠컴컴컴탠컴컴컴컴컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴컴컴탠컴컴컴컴컵컴컴컴컴컴컴컵컴컴컴컴컴컴캑 �30 � 001 � 1110 쿝esponse to STATUS� - �5.8.10 쿗U, LN � 쿞TAT � � � � 쿐NQUIRY � � � � � � 쳐컴컴탠컴컴컴탠컴컴컴탠컴컴컴컴컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴컴컴탠컴컴컴컴컵컴컴컴컴컴컴컵컴컴컴컴컴컴캑 �31 � 001 � 1111 쿙ormal, � - �5.8.4 쿝N � 쿝EL COM � � � � 퀅nspecified � � � � 쿏ISC � 쳐컴컴탠컴컴컴탠컴컴컴탠컴컴컴컴컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴컴컴탠컴컴컴컴컵컴컴컴컴컴컴컵컴컴컴컴컴컴캑 �34 � 010 � 0010 쿙o circuit/ � - �5.1.1 쿗N � 쿝EL COM � � � � 쿬hannel � �5.1.2 � � � � � � � 쿪vailable � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컴� � � � � � �5.2.3.1b 쿝U 쿝EL COM. 쿏ISC � � � � � � �5.2.3.1e � � � � � � � � � �5.2.3.2 � � � � � � � � � �6.2.2.3.1 � � � � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컴� � � � � � 쿎.2 쿗N 쿝EL COM, DISC쿝EL COM, DISC� � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컴� � � � � � 쿎.2 쿟N � 쿏ISC � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컴� � � � � � 쿏.1.1e 쿗PE � 쿝EL COM � � � � � � 쿏.3.b � � � � 쳐컴컴탠컴컴컴탠컴컴컴탠컴컴컴컴컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴컴컴탠컴컴컴컴컵컴컴컴컴컴컴컵컴컴컴컴컴컴캑 �38 � 010 � 0110 쿙etwork out of � - 쿙o � � � � � � � 쿽rder � 쿾rocedure � � � � 쳐컴컴탠컴컴컴탠컴컴컴탠컴컴컴컴컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴컴컴탠컴컴컴컴컵컴컴컴컴컴컴컵컴컴컴컴컴컴캑 �41 � 010 � 1001 쿟emporary � - �5.8.8 쿗U, LN � 쿏ISC � � � � 쿯ailure � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컴� � � � � � �5.8.10 쿗N, RU, RN쿏ISC 쿏ISC � 읕컴컴좔컴컴컴좔컴컴컴좔컴컴컴컴컴컴컴컴컨컴컴컴컴컴컨컴컴컴컴컴컴좔컴컴컴컴컨컴컴컴컴컴컴컨컴컴컴컴컴컴켸 TABLE I-2/Q.931 (5 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �42 � 010 � 1010 쿞witching equip- � - 쿙o � � 쿝EL � � � � 쿺ent congestion � 쿾rocedure � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �43 � 010 � 1011 쿌ccess informa- 쿏iscarded �7.1.5.7 쿝U, LN, RU� 쿎ON CON � � � � 퀃ion discarded 쿶nto element 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � 쿶dentifier(s)�7.1.6.1 쿗N � 쿞TAT � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.8.7.2 쿗N, LU � 쿞TAT � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �44 � 010 � 1100 쿝equested � - �5.1.2 쿗N � 쿝EL COM � � � � 쿬ircuit/channel � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � 쿻ot available � �5.2.3.1e 쿝U 쿝EL COM. 쿏ISC � � � � � � �5.2.3.2 � � � � � � � � � �6.2.2.3.1 � � � � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � 쿏.1.1.e � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �47 � 010 � 1111 쿝esource � - 쿙o � � � � � � � 퀅navailable, � 쿾rocedure � � � � � � � 퀅nspecified � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �49 � 011 � 0001 쿜uality of Service쿎ondition �6 � � 쿝EL � � � � 퀅navailable � � � � 쿝EL COM � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (6 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �50 � 011 � 0010 쿝equested 쿑acility �7.1.3.6 쿝U 쿏ISC 쿏ISC � � � � 쿯acility not 쿶dentific- � � 쿝EL COM. � � � � � 퀂ubscribed 쿪tion �7.1.4.3 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � �7.1.5.3 쿝N � 쿏ISC � � � � � � � 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � �7.1.7.4 쿗N � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �57 � 011 � 1001 쿍earer capability 쿌ttributes �5.1.5.2 쿗N � 쿏ISC � � � � 쿻ot authorized 쿽f bearer � � � 쿝EL COM � � � � � 쿬apability 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �7.2.2 쿗N � 쿝EL � � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �58 � 011 � 1010 쿍earer capability 쿌ttributes �5.1.5.2 쿗N � 쿏ISC � � � � 쿻ot presently 쿽f bearer � � � 쿝EL COM � � � � 쿪vailable 쿬apability 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �7.2.2 쿗N � 쿝EL � � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �63 � 011 � 1111 쿞ervice or option � - �5.1.5.2 쿗N � 쿏ISC � � � � 쿻ot available, � � � � 쿝EL COM � � � � 퀅nspecified � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �65 � 100 � 0001 쿍earer capability 쿌ttributes �5.1.5.2 쿗N � 쿏ISC � � � � 쿻ot implemented 쿽f bearer � � � 쿝EL COM � � � � � 쿬apability 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �6.1 쿗N � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �66 � 100 � 0010 쿎hannel type not 쿎hannel type 쿙o � � � � � � � 쿶mplemented � 쿾rocedures � � � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (7 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �69 � 100 � 0101 쿝equested facility쿑acility �7.1.3.6 쿝U 쿏ISC 쿏ISC � � � � 쿻ot implemented 쿶dentific- � � 쿝EL COM � � � � � � 쿪tion �7.1.4.3 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � �7.1.5.3 쿝N � 쿝EL � � � � � � � � � 쿏ISC � � � � � � � 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � �7.1.7.4 쿗N � 쿝EL � � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �70 � 100 � 0110 쿚nly restricted � - 쿙o � � � � � � � 쿭igital informa- � 쿾rocedure � � � � � � � 퀃ion bearer � �(network � � � � � � � 쿬apability is � 쿭ependent � � � � � � � 쿪vailable � 쿽ption) � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �79 � 100 � 1111 쿞ervice or option � � � � � � � � � 쿻ot implemented, � � � � � � � � � 퀅nspecified � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �81 � 101 � 0001 쿔nvalid call � - �5.8.3.2a 쿗U, LN � 쿝EL � � � � 퀁eference value � � � � 쿝EL COM � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.8.3.2b 쿗U, LN � 쿝EL COM � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.8.3.2f 쿗U, LN � 쿞TAT � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �82 � 101 � 0010 쿔dentified channel쿎hannel 쿙o � � 쿝EL COM � � � � 쿭oes not exist 쿶dentity 쿾rocedure � � � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (8 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �83 � 101 � 0011 쿌 suspended call � - �5.6.5 쿗N � 쿝ES REJ � � � � 쿮xists, but this � � � � � � � � � 쿬all identity � � � � � � � � � 쿭oes not � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �84 � 101 � 0100 쿎all identity in � - �5.6.3 쿗N � 쿞USP REJ � � � � 퀅se � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �85 � 101 � 0101 쿙o call suspended � - �5.6.5 쿗N � 쿝ES REJ � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �86 � 101 � 0110 쿎all having the � �5.6.5 쿗N � 쿝ES REJ � � � � 퀁equested call � � � � � � � � � 쿶dentity has been � � � � � � � � � 쿬leared � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �88 � 101 � 0111 쿔ncompatible 쿔ncompatible �5.2.2 � RU 쿝EL COM 쿏ISC � � � � 쿭estination 쿾arameter �5.2.5.1 � � � � � � � � � �5.2.5.3a � � � � � � � � � 쿍.3.2 � � � � � � � � � 쿍.3.3 � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �91 � 101 � 1011 쿔nvalid transit � - 쿎.2 쿟N � 쿏ISC � � � � 쿻etwork selection � � 쳐컴컴컴컴컵컴컴컴컴컴컵컴컴컴컴캑 � � � � � � 쿗N � 쿏ISC, REL� � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �95 � 101 � 1111 쿔nvalid message, 쿘essage type �5.8 쿗N � 쿝EL COM � � � � 퀅nspecified � � � � 쿞TAT � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (9 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �96 � 110 � 0000 쿘andatory 쿔nformation �5.8.6.1 쿗N, LU � 쿝EL � � � � 쿶nformation 쿮lement � � � 쿝EL COM. � � � � 쿮lement is missing쿶dentifier(s)� � � 쿞TAT � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.8.11 쿗N, LU � 쿞TAT � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �97 � 110 � 0001 쿘essage type 쿘essage type �5.8.4 쿗U, LN � 쿞TAT � � � � 쿻on-existent or � �5.8.10 � � � � � � � 쿻ot implemented � �5.8.11 � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �98 � 110 � 0010 쿘essage not 쿘essage type �5.8.4 쿗U, LN � 쿞TAT � � � � 쿬ompatible with � � � � � � � � � 쿬all state or � � � � � � � � � 쿺essage type � � � � � � � � � 쿻on-existent or � � � � � � � � � 쿻ot implemented � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �99 � 110 � 0011 쿔nformation 쿔nformation �5.8.7.1 쿗U, LN � 쿞TAT � � � � 쿮lement non- 쿮lement �5.8.11 � � � � � � � 쿮xistent or not 쿶dentifier(s)쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � 쿶mplemented � �5.8.7.1 쿗N � 쿝EL � � � � � � � � � 쿝EL COM � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (10 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �100 � 110 � 0100 쿔nvalid informa- 쿔nformation �5.8.6.2 쿗U, LN � 쿞TAT � � � � 퀃ion element 쿮lement � � � 쿝EL � � � � 쿬ontents 쿶dentifier(s)� � � 쿝EL COM � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.8.7.2 쿗U, LN � 쿞TAT � � � � � � �5.8.11 � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �101 � 110 � 0101 쿘essage not 쿘essage type �5.8.4 쿗N, LU � 쿞TAT � � � � 쿬ompatible with � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � 쿬all state � �5.8.11 쿗N, LU � 쿏ISC � � � � � � � � � 쿝EL � � � � � � � � � 쿝EL COM � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �102 � 110 � 0110 쿝ecovery on time 쿟imer number �5.2.4 쿗N � 쿏ISC � � � � 쿮xpiry � �5.2.5.3 � � � � � � � � � �5.6.5 � � � � � � � � � �5.4.1 � � � � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.3.3 쿗N � 쿝EL � � � � � � �5.3.4 � � � � � � � � � 쳐컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� � � � � � �5.3.2f 쿗U � 쿝EL � � � � � � �5.3.3 � � � � � � � � � �5.6.5 � � � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� TABLE I-2/Q.931 (11 of 11) Usage of cause values 旼컴컴컫컴컴컴컫컴컴컴컫컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴쩡컴컴컴컴컴컫컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴� � � � � � � � � Typical carrying � 쿎ause � Class � Value � Cause name � Diagnostics � Section 쿟ypical � message as � 쿙o. � � � � � cross- 쿹ocation � identified by � � � � � � � reference 쿽f � receiving side � � � � � � � 쿲eneration쳐컴컴컴컴컴쩡컴컴컴컴� � � � � � � � � At remote 쿌t local � � � � � � � � � interface 쿶nterface� 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �111 � 110 � 1111 쿛rotocol error, � �5.8.4 쿝N � 쿏ISC � � � � 퀅nspecified � � � � � � 쳐컴컴컵컴컴컴컵컴컴컴컵컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴탠컴컴컴컴컴컵컴컴컴컴컴탠컴컴컴컴컴탠컴컴컴컴� �127 � 111 � 1111 쿔nterworking, � 쿙o explicit � � � � � � � 퀅nspecified � 쿾rocedure � � � � 읕컴컴컨컴컴컴컨컴컴컴컨컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴좔컴컴컴컴컴컨컴컴컴컴컴좔컴컴컴컴컴좔컴컴컴컴� Appendix II (to Recommendation Q.931) Example message flow diagrams and example conditions for cause mapping II.1 Example message flow diagrams Examples of the procedures for the use of the B and D channel network connection types and the selection of the appropriate channel types are summarized in Figures II-1/Q.931 to II-7/Q.931. These figures are intended to complement the description in the preceding text and do not illustrate all possible situations. Note - Not all frames that may be sent across the TA interface may be represented in the following figures. II.1.1 Key to the figures RECOUP cont. of recoup II.11 Key to figures II.1.2 Example message flow diagrams FIGURE II-1/Q.931 Example message sequence for the ISDN virtual service B-channelaccess first virtual call set-up in this channel recoup FIGURE II-2/Q.931 recoup FIGURE II-3/Q.931 recoup FIGURE II-4/Q.931 recoup FIGURE II-5/Q.931 recoup FIGURE II-6/Q.931 recoup FIGURE II-7/Q.931 II.2 Example conditions for cause mapping Figures II-8/Q.931 through II-16/Q.931 show example conditions when cause mappings would be utilized between Q.931 and X.25 [5] messages and utilize the specific mappings of Table 6-5/Q.931 and Table 6-6/Q.931 as shown below: recoup FIGURE II-9/Q.931 and FIGURE II-10/Q.931 recoup FIGURE II-11/Q.931 and FIGURE II-12/Q.931 recoup FIGURE II-13/Q.931 and FIGURE II-14/Q.931 recoup FIGURE II-15/Q.931 and FIGURE II-16/Q.931 Appendix III (to Recommendation Q.931) Summary of assigned information element identifier and message type code points for the Q.93X-Series of Recommendations TABLE III-1 Information element code points TABLE III-2 Message type code points 8 7 6 5 4 3 2 1 Recommendation reference 컴컴컴컴컴컴컴 0 0 0 0 0 0 0 0 Escape to nationally Q.931 specific message type 0 0 0 - - - - - Call establishment messages: 0 0 0 0 1 ALERTING Q.931 0 0 0 1 0 CALL PROCEEDING Q.931 0 0 0 1 1 PROGRESS Q.931 0 0 1 0 1 SETUP Q.931 0 0 1 1 1 CONNECT Q.931 0 1 1 0 1 SETUP ACKNOWLEDGE Q.931 0 1 1 1 1 CONNECT ACKNOWLEDGE Q.931 0 0 1 - - - - - Call information phase messages: 0 0 0 0 0 USER INFORMATION Q.931 0 0 0 0 1 SUSPEND REJECT Q.931 0 0 0 1 0 RESUME REJECT Q.931 0 0 1 0 0 HOLD Q.932 [4] 0 0 1 0 1 SUSPEND Q.931 0 0 1 1 0 RESUME Q.931 0 1 0 0 0 HOLD ACKNOWLEDGE Q.932 0 1 1 0 1 SUSPEND ACKNOWLEDGE Q.931 0 1 1 1 0 RESUME ACKNOWLEDGE Q.931 1 0 0 0 0 HOLD REJECT Q.932 1 0 0 0 1 RETRIEVE Q.932 1 0 0 1 1 RETRIEVE ACKNOWLEDGE Q.932 1 0 1 1 1 RETRIEVE REJECT Q.932 0 1 0 - - - - - Call clearing messages: 0 0 1 0 1 DISCONNECT Q.931 0 0 1 1 0 RESTART Q.931 0 1 1 0 1 RELEASE Q.931 0 1 1 1 0 RESTART ACKNOWLEDGE Q.931 1 1 0 1 0 RELEASE COMPLETE Q.931 0 1 1 - - - - - Miscellaneous messages: 0 0 0 0 0 SEGMENT Q.931 0 0 0 1 0 FACILITY Q.931 0 0 1 0 0 REGISTER Q.932 [4] 0 1 1 1 0 NOTIFY Q.931 1 0 1 0 1 STATUS ENQUIRY Q.931 1 1 0 0 1 CONGESTION CONTROL Q.931 1 1 0 1 1 INFORMATION Q.931 1 1 1 0 1 STATUS Q.931 TABLE III-3 Operation values assigned within the invoke component of the facility information element 8 7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 User-user service Acronyms used in Recommendation Q.931 旼컴컴컴컴컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 � Acronym � � 쳐컴컴컴컴쩡컴컴컴컴쩡컴컴컴컴� Meaning � � English � French � Spanish � � 쳐컴컴컴컴탠컴컴컴컴탠컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 � ABM � � 쿌synchronous Balanced Mode (of HDLC) � � ACK � � 쿌cknowledgement � � ADPCM � � 쿌daptative Differential Pulse Code Modulation � � AFI � � 쿌uthority and Format Identifier � � ARM � � 쿌synchronous Response Mode (of HDLC) � � AU � � 쿌ccess Unit � � � � � � � BC � � 쿍earer Capability � � BCD � � 쿍inary Coded Decimal � � Bi � � 쿔ndicated B Channel � � B � � 쿌n idle B Channel Bi � � Bj � � 쿌 B Channel in use � � � � � � � CEI � � 쿎onnection Endpoint Identifier � � CES � � 쿎onnection Endpoint Suffix � � CSPDN � � 쿎ircuit Switched Public Data Network � � � � � � � D � � 쿟he D Channel � � DDI � � 쿏irect Dialling In � � DLCI � � 쿏ata Link Connection Identifier (See Recommendations Q.920/Q.921) � � DTE � � 쿏ata Terminal Equipment � � � � � � � HDLC � � 쿓igh Level Data Link Control (procedures) � � HLC � � 쿓igh Layer Compatibility � � � � � � � I � � 쿔nformation (frame) � � IA5 � � 쿔nternational Alphabet No. Five (defined by CCITT) � � IE � � 쿔nformation Element � � ISDN � � 쿔ntegrated Services Digital Network � � ISO � � 쿔nternational Standard Organization � � IWF � � 쿔nterworking Function � � IWU � � 쿔nterworking Unit � 읕컴컴컴컴좔컴컴컴컴좔컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸 旼컴컴컴컴컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 � Acronym � � 쳐컴컴컴컴쩡컴컴컴컴쩡컴컴컴컴� Meaning � � English � French � Spanish � � 쳐컴컴컴컴탠컴컴컴컴탠컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 � LAN � � 쿗ocal Area Network � � LAPB � � 쿗ink Access Protocol-Balanced � � LAPD � � 쿗ink Access Protocol on the D Channel � � LLC � � 쿗ow Layer Compatibility � � LLI � � 쿗ogical Link Identifier (See Recommendation Q.921) � � � � � � � NACK � � 쿙egative Acknowledgement � � NIC � � 쿙etwork Independent Clock � � NRM � � 쿙ormal Response Mode (of HDLC) � � NSAP � � 쿙etwork Service Access Point � � NT2 � � 쿙etwork Termination of type two � � � � � � � OSI � � 쿚pen System Interconnection � � � � � � � PABX � � 쿛rivate Automatic Branch Exchange � � PCM � � 쿛ulse Code Modulation � � PH � � 쿛acket Handler � � PSPDN � � 쿛acket Switched Public Data Network � � PSTN � � 쿛ublic Switched Telephony Network � � PVC � � 쿛ermanent Virtual Circuit � � � � � � � RDTD � � 쿝estricted Differential Time Delay � � � � � � � SABME � � 쿞et Asynchronous Balanced Mode Extended (frame) � � SAPI � � 쿞ervice Access Point Identifier (See Recommendation Q.921) � � � � � � � TA � � 쿟erminal Adaptor (See Recommendation I.411) � � TE1 � � 쿟erminal Equipment of type 1 (See Recommendation I.411) � � TE2 � � 쿟erminal Equipment of type 2 (See Recommendation I.411) � � TEI � � 쿟erminal Endpoint Identifier (See Recommendations Q.920 and Q.921)� � � � � � � UI � � 쿢nnumbered Information (frame) � � UDI � � 쿢nrestricted Digital Information � � � � � � � VC � � �(Switched) Virtual Circuit � 읕컴컴컴컴좔컴컴컴컴좔컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸 REFERENCES [1] CCITT Recommendation Q.930(I.450) ISDN user-network interface layer 3 - General aspects. [2] CCITT Recommendation I.412 ISDN user-network interfaces - Interface structures and access capabilities. [3] CCITT Recommendation Q.921(I.441) ISDN user-network interface data link layer specification. [4] CCITT Recommendation Q.932 - Generic procedures for the control of ISDN supplementary services. [5] CCITT Recommendation X.25 - Interface between data terminal equipment (DTE) and data circuit terminating equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. [6] CCITT Recommendation I.231 - Circuit mode bearer service categories. [7] CCITT Recommendation V.110 - Support of data terminal equipments (DTEs) with V-series type interfaces by an Integrated Services Digital Network (ISDN). [8] CCITT Recommendation X.30 - Support of X.21, X.21bis and X.20bis based data terminal equipments (DTEs) by an Integrated Services Digital Network (ISDN). [9] CCITT Recommendation V.120 - Support by an ISDN of data terminal equipment with V-series type interfaces with provision for statistical multiplexing. [10] CCITT Recommendation G.711 - Pulse code modulation (PCM) of voice frequencies. [11] CCITT Recommendation G.721 - 32 kbit/s adaptive differential pulse code modulation (ADPCM). [12] CCITT Recommendation G.722 - 7 kHz audio coding within 64 kbit/s. [13] CCITT Recommendation G.7xx1 - 384 bits video. [14] CCITT Recommendation X.31 - Support of packet mode terminal equipment by an ISDN. [15] CCITT Recommendation I.460 - Multiplexing rate adaptation and support of existing interfaces. [16] CCITT Recommendation V.6 - Standardization of data signalling rates for synchronous data transmission on leased telephone-type circuits. [17] CCITT Recommendation X.1 - International user classes of service in public data networks and Integrated Services Digital Networks (ISDNs). [18] CCITT Recommendation I.330 - ISDN numbering and addressing principles. [19] CCITT Recommendation E.164 - Numbering plan for the ISDN era. 컴컴컴컴컴컴컴 1 These titles will appear in the Blue Book Text. [20] CCITT Recommendation E.163 - Numbering plan for the international telephone service. [21] CCITT Recommendation X.121 - International numbering plan for public data networks. [22] CCITT Recommendation F.69 - Plan for telex destination codes. [23] CCITT Recommendation X.213 - Network Service Definition for Open Systems Interconnection for CCITT Applications. [24] ISO 8348 Addendum 2 - Information processing systems - Data communications - Network service definition. [25] CCITT Recommendation I.334 - Principles relating ISDN number/subaddresses to the OSI reference model network layer addresses. [26] CCITT Recommendation X.21 - Interface between data terminal equipment (DTE) and data circuit-terminating equipment (DCE) for synchronous operation on public data networks. [27] CCITT Recommendation I.431 - Primary rate user-network interface - Layer 1 specification. [28] CCITT Recommendation T.62 - Control procedures for Teletex and Group 4 facsimile services. [29] CCITT Recommendation T.503 - A document application profile for the interchange of Group 4 facsimile documents. [30] CCITT Recommendation T.501 - A document application profile MM for the interchange of formatted mixed mode documents. [31] CCITT Recommendation T.502 - Document application profile PM1 for the interchange of processable form documents. [32] CCITT Recommendation T.70 - Network independent basic transport service for the Telematic service. [33] CCITT Recommendation T.504 - Document application profile for Videotex interworking. [34] CCITT Recommendation I.212 - Teleservices supported by an ISDN. [35] CCITT Recommendation G.724 - Characteristics of 48-channel low bit rate encoding primary multiplex operating at 1544 kbit/s. [36] ISO 1745 Information processing - Basic mode control procedures for data communication systems. [37] CCITT Recommendation T.71 - Link Access Protocol Balanced extended for half-duplex physical level facility. [38] ISO 4335 Data communication - High-level data link control procedures - Consolidation of elements of procedures. [39] ISO 8802-2 Information processing systems - Local area networks - Part 2: Logical link control. [40] CCITT Recommendation X.75 - Packet switched signalling system between public networks providing data transmission services. [41] ISO 8208 Information processing systems - Data communications - X.25 Packet Level Protocol for Data Terminal equipment. [42] ISO 8348 Information processing systems - Data communications - Network service definition. [43] ISO 8473 Information processing systems - Data communications protocol for providing the connectionless-mode network service. [44] CCITT Recommendation X.244 - Procedure for the exchange of protocol identification during virtual Call Establishment on packet Switched Public Data Networks. [45] CCITT Recommendation Q.920(I.440) ISDN user-network interface data link layer - General aspects. [46] CCITT Recommendation I.430 - Basic user-network interface - Layer 1 specification. [47] CCITT Recommendation I.230 - Definition of bearer service categories. [48] CCITT Recommendation I.240 - Definition of teleservices. [49] CCITT Recommendation T.50 - International Alphabet No. 5. [50] ISO 646 Information processing - ISO 7-bit coded character set for information interchange. [51] CCITT Recommendations - Integrated Services Digital Network (ISDN). [52] CCITT Recommendation I.463 - Support of Data Terminal Equipments (DTEs) with V-series type interfaces by an Integrated Services Digital Network (ISDN). 컴컴컴컴컴컴컴컴컴