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X.21 CALL PROGRESS MESSAGES
D-6
Number dialed is
busy.
Try again later.
Number busy (21)
The called DTE is
detected by the Data
Communications
Equipment (DCE) as
engaged on other call(s),
and therefore as not
being able to accept the
incoming call.
User busy (17)
This cause is used to indicate that the
called party is unable to accept another
call because the user busy condition has
been encountered. This cause value may
be generated by the called user or by the
network. In the case of user determine
user busy, it is noted that the user
equipment is compatible with the call.
Table D-1: X.21 Call Progress Signals and Q.931 Cause Codes (Continued)
Message Text
X.21 Signal and Code
Q.931 Cause and Code
Summary of Contents for Concorde 4500
Page 1: ...Concorde 4500 Administrator s Guide ...
Page 6: ......
Page 12: ......
Page 18: ......
Page 19: ...Introducing the Concorde 4500 ...
Page 38: ......
Page 39: ...Connecting and ConÞguring Your Network ...
Page 68: ......
Page 69: ...Managing the Dialing Directory ...
Page 79: ...ConÞguring General Options for Your System ...
Page 99: ...ConÞguring and Adjusting the Video and Audio ...
Page 139: ...ConÞguring Ports ...
Page 140: ...This chapter describes how to Set the control ports Set the data ports ...
Page 153: ...Obtaining Diagnostic Information ...
Page 185: ...Resolving Problems ...
Page 202: ......
Page 206: ......
Page 226: ......