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7-10 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Configuring T1 Cards
Configuring overlap receiving on PRI lines
trailing-digits = 2
t302-timer = 10000
[in E1/{ shelf-1 slot-12 1 }:line-interface]
signaling-mode = isdn
overlap-receiving = yes
pri-prefix-number = 3069
trailing-digits = 2
t302-timer = 10000
To configure overlap receiving, you need to set some or all of the following parameters:
Parameter Specifies
Signaling-Mode Type of signaling on the T1 or E1 line. It must specify ISDN (or
ISDN-NFAS, for T1) to use overlap receiving. If it is set to any other
value, Overlap-Receiving does not apply.
Overlap-Receiving Enables/disables overlap receiving for incoming calls on the PRI line.
If set to No (the default), the PRI-Prefix-Number, Trailing-Digits, and
T302-Time parameters do not apply for overlap receiving.
PRI-Prefix-Number Portion of the line’s telephone number to be used when matching the
called-party number in the Setup message from the network switch.
The reason for specifying this number is to enable the TAOS unit to
quickly determine when the called-party number is complete when
overlap receiving is in use. The unit uses this number and the specified
number of trailing digits to recognize that the called-party number is
complete, even if the caller did not include a Sending Complete code
(for example, by dialing the pound sign).
Typically, the PRI prefix is an ISDN-subscriber number, that might
include an area code or an area and country code combination (which
must be separated from the ISDN-subscriber number by a hyphen).
With this additional information, the TAOS unit looks for just the first
match of PRI-Prefix-Number against the called-party number in the
Setup message (first with area code, and if that fails, then without area
code).
The default null value disables the T302-Timer optimization.
Trailing-Digits
Number of digits required to follow the prefix number for the
TAOS unit to consider the called number complete. Callers can
indicate Sending Complete by a method such as dialing the pound sign
(#). If a caller does not indicate Sending Complete and the TAOS unit
cannot determine whether the called number is complete, the
TAOS unit waits until the T302 timer expires even if the caller has
dialed all the required digits.
The Trailing-Digits setting enables the TAOS unit to reset the timer
when the specified number of digits has been received. Trailing-Digits
can specify a value from 1 to 6. The default value is 2.