CDN" Control Directory Number sounds like a Meridian ACD to me and it can be called internally, either in standard ACD package or CCMS.
Assign a target line to an internal DN and turn up the target line to be answered by the Contact Centre.
To have Contact Center answer a line:
From the Answer Mode list box, select Contact Center. You cannot change the Answer Mode if you log on as a Contact Center Supervisor.
In the Table/Skillset Number box, type the number of the skillset you want to assign to the line. The number can be from 1 to the maximum number of configured skillsets. The default is 1.
From the Number of rings box, select the number of rings.
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