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Configuring T1 Cards
Assigning telephone numbers to switched channels
APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide Preliminary May 9, 2000 7-19
Assigning telephone numbers to switched channels
Channel assignments typically specify add-on numbers, not full telephone numbers. Add-on
numbers include only the rightmost digits needed to distinguish one number from another. For
example, if a line is assigned 23 numbers, all of which begin with 212-555-, the add-on
number is the unique set of digits to the right of these common digits.
The most common reason multichannel calls fail to add channels properly is that the calling
unit cannot use the add-on numbers it receives. To avoid this problem, make sure that the
add-on numbers you assign all have the same number of digits.
When a caller initiates a multichannel call, it first dials the base channel and then requests
additional numbers for dialing the additional channels. When it receives add-on numbers, the
caller integrates them with the number it dialed for the base channel as follows:
• If the add-on number has fewer digits than the dialed number, the caller pads the add-on
number with the leftmost digits that are included in the dialed number but not in the
add-on number. For example, if the add-on number is 6532 and the dialed-number is
9-212-555-1212, the caller uses 9-212-555-6532 to dial the next channel.
• If the add-on number has more digits than the dialed number, the caller discards extra
digits in the add-on numbers, starting with the leftmost digit.
• If the add-on number has the same number of digits as the dialed number, the entire
add-on number is used. For example, if 6532 is the add-on number and 6588 is the dialed
number, the caller uses 6532 to dial the next channel.
To assign add-on numbers to the channels of a T1 line, proceed as in the following example:
admin> list line channel
channel-config[1]={switched-channel 9 "" {any-shelf any-slot 0} 0 }
channel-config[2]={switched-channel 9 "" {any-shelf any-slot 0} 0 }
channel-config[3]={switched-channel 9 "" {any-shelf any-slot 0} 0 }
...
channel-config[24]={switched-channel 9 "" {any-shelf any-slot 0} 0}
admin>
set 1 phone = 60
admin> set 2 phone = 61
admin> set 3 phone = 62
admin> set 4 phone = 63
admin> set 5 phone = 64
In a hunt group, a group of channels is assigned the same telephone number. When a call
comes in on that number, the TAOS unit uses the first available channel to which the number is
assigned. Because channels in a hunt group share a common telephone number, the add-on
numbers in the profile are all the same.
The following example shows how to configure two groups of four channels with hunt groups:
admin> set 6 phone = 70
admin> set 7 phone = 70
admin> set 8 phone = 70
admin> set 9 phone = 70
admin> set 10 phone = 72
admin> set 11 phone = 72
admin> set 12 phone = 72