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10.7 ACRONYMS 273TABLE 10.6-2 Coding of IE.6 (Cause) and IE.12 (Signal) in Messages RLCOM,DISC, and PROG Sent in Setup FailuresFailure Description Location Cause Value IE.12F1 No B-channel available on calling DSL (N) 2 34 3F2 Unassigned number (N) 2 1 3 (note 1)F3 User busy (N) 4 17 4F4 User busy (U) 0 17 4F5 No user responding (N) 4 18 1F6 User alerting, no answer (N) 4 19 63Notes: (1) IE.12 included only when bearer service is 64 kb/s. (2) Functional meanings of the listed decimalcodes:IE.6IE.6—Location0 User2 Public network serving the local user4 Public network serving the remote userIE.6—Cause Value1 Unassigned number17 User busy18 No user responding19 User alerting, no answer34 Calling B-channel not availableIE.121 Ringing-tone on3 Reorder-tone on4 Busy-tone on63 Tones offThe exchange does not need to release the B-channel in the other failures,because it has not broadcast a SETUP message (failures Fl, F2, and F3), or hassent a SETUP message and has received no response or “busy” responses only (F4).10.7 ACRONYMSAiALERTB-ChannelBCDBSNCALPRCCBCONACKCONNAction indicatorAlerting message64-kb/s Channel for circuit-mode communicationsBinary coded decimal digitBackward sequence numberCall Proceeding messageCheck-bitConnect Acknowledgment messageConnect message

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