I would recommend you find the Automatic Call Distribution
Fundamentals NTP but I have put brief excerpts from this guide. Obviously timers are involved but this is to much to go over here in such a forum.
Can be downloaded from Nortel if you have access, if you do not your Vendor should be able to supply it for you.
Configure the Interflow DN (IFDN)
This command indicates, for each ACD DN, the destination DN for ACD calls when the Interflow feature is active. The command format is as follows:
IFDN XXXX yyy ... y YYY ... Y
Where:
XXXX = Applicable ACD DN, up to seven digits if DNXP
yyy .. y = Current Interflow DN/ACD can be any Interflow DN
YYY .. Y = New Interflow DN, up to 23 digits including the asterisk
(*) to indicate a dialing pause. A value of X disables the
Interflow feature even though an Interflow key might be assigned to a supervisor position. If equipped with EAR, use the following:
XXXX = Applicable ACD DN; it cannot be a CDN
yyyy and YYYY = Can be a CDN
Pauses are supported on analog and DTI trunks but are not supported on ISDN trunks. The asterisk (*) used to introduce a pause is supported on analog and DTI trunks but is not supported on ISDN trunks.On ISDN trunks, if OPAO is enabled, the asterisk (*) is outpulsed as a called party digit.
Overflow by Number (OVDN)
Overflow DNs defined at the OVDN prompt in LD 23 are not used by NACD. They are used by Overflow by Number only. The same ACD DNs can be defined in the NACD Routing Tables as local targets. OVDN then recalls to source when the call waits longer than the timer.
CCMS is a Application server that when installed takes over the call routing which gives you so much more control over the call routing.