• Traffic that is mis-routed at the code level can be identified by correlating empirical CDRs collected from the network, with trunk network topology and trunk capacity metrics.

• The mis-route analysis algorithm identifies opportunities in which calls transit from EOA to EOY through tandem T1, yet there exists a direct trunk group, PH1, between the two switches.

• Codes are then flagged as potential mis-routed codes if the capacity metrics of PH1 indicate that during the time of the call there was no overflow pegged for that trunk group.

• Existing tandem switch (T1) exhausts capacity.
• New tandem switch (T2) installed to provide relief.
• Set of end offices (B) are “rehomed” from existing tandem to new tandem.

Planning and Design Questions

• Initial sizing of trunk groups between the rehomed end offices and the new tandem?
• For each non-rehomed end office, is there sufficient traffic to warrant an Intermediate High-Usage (IH) trunk group to the new tandem? If so, how large?
• How much relief can be expected at the exhausted tandem?