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11 Bit Option
0-2 &K (flow control, d = 0)
3 &R (RTS option, d = 0)
4-7 reserved
default: 00 (0 x 00)
12 reserved
17.2.4 External Interfaces (Microsoft TAPI)
The Deskmaster 510i and 520i provides a TSPI driver for the Microsoft Telephone Application
Programming Interface (TAPI). All ISDN phone functions may be controlled through that interface.
18 ERROR MESSAGES/CAUSES
Deskmaster Q.931 Spec. Cause description
Cause Cause
(HEX) (DEC)
11Unallocated (unassigned) number
22No route to specific transit network
33No route to destination
66Channel unacceptable
77Call awarded and being delivered in an established channel
10 16 Normal call clearing
11 17 User busy
12 18 No user responding
13 19 No answer from user (user alerted)
15 21 Call rejected
16 22 Number changed
1A 26 Non-selected user clearing
1B 27 Destination out of order
1C 28 Invalid number format
1D 29 Facility rejected
1E 30 Response to STATUS ENQUIRY
1F 31 Normal, unspecified
22 34 No circuit/channel available
26 38 Network out of order
29 41 Temporary failure
2A 42 Switching equipment congestion
2B 43 Access information discarded
2C 44 Requested circuit/channel not available
2F 47 Resources unavailable, unspecified
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