NIO CommKit Host Interface Installation and System Administration Manual

3-27
Control Tables (from AT&T 255-110-127)
srvtab
If the administrator was certain that no other systems in the exchange nj/cc
had originating groups that began with the prefix myux, the mapping entries
for the previous example could be shortened to:
# transparent administrative mappings
nj/cc/myux* rl U/vx *n<100 %s -Dsh
#
# translated user mappings
nj/cc/myux* rl U/vx &>100 %s -Dsh
Trapping Incoming Calls
The Server Table Scanning Rules section describes how the dkserver pro-
gram scans the server table to match and accept incoming calls. Successfuly
matching a line in the server table results in an accepted call. Failure to find
a match in the server table results in a rejected call.
When an incoming call is accepted, a call answered code is sent back
through the data switch network to the requester. Rejected calls are
answered with an appropriate rejection code such as access denied, busy, no
answer or out of service. These rejection codes are defined as constants in
the header file /usr/include/dkit/dk_unixp.h with the prefix Ed. Examples
are shown in Table 3-4.
Table 3-4 Rejection Code Examples
The optional T (trap) server table flag provides a mechanism to reject
incoming calls that match a line of the server table. All server table mapping
lines that contain the trap flag in the flags field will reject an incoming call
when the call successfully matches the line. These lines may be considered
trapping lines. Server table mapping lines that do not contain the T trap flag
will function as before by accepting the incoming call and generating the
specified program according to the other flags in the flags field.
To make the call trapping facility as flexible as possible, the administrator
may select the rejection code to be used by each trapping line by specifying
it as the first argument in the initial_parameters field. The remainder of the
Label Value Description
EdBUSY 1 All channels busy
EdNOANSWER 3 Server not answering
EdNOACC 7 Access denied