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Only the Primary TBB number from each line will be designated as the outbound number.
Line one: 416-555-0123 - in/out displays this Primary TBB#
ALT#1: 780-555-0123 - in only
ALT#2: 604-555-0123 - in only
Line two: 604-555-6789 - in/out displays this Primary TBB#
ALT#1: 780-555-6789 - in only
ALT#2: 416-555-6789 - in only
You can also choose to have a second TBB Primary number (not an ALT#) subscribed to on a second DVG ATA, instead of the same unit.
Regardless of the number of DVGs, you should ensure there is sufficient BROADBAND Bandwidth to handle the number of Primary TBB lines you want. For example, 2 Primary TBB lines will require about 160kbs in each direction, for high quality voice using the g711 codec.
Call Primus Customer Service to add a second Primary line to your existing DVG ATA, or a new DVG ATA altogether; and to determine the cost.