Customers wanting DPT for Survivable Core Server-controlled Port Networks (PNs) must migrate those PNs from Fiber-PNC to IP-PNC. Fiber-connected cabinets must be in Network Region 1.

Fiber-PNC users can reach disconnected users in other Network Regions through DPT.

IP-PNC/GW can only initiate DPT calls to the fiber-PNC fragment that contains the trunks associated with the IGAR LDN.

Users connected through Fiber-PNC cannot use DPT if another fiber PN fails over to different Survivable Core Server. This is because DPT is not triggered within same Network Region.