ajobbins:sbiddle: Phone numbers can't be moved between NEAX changes, so if you have ported to Orcon and are now moving back to a wholesale connection on another exchange or a cabinetised connection you'll have to move to VoIP if you want to keep your number, or pay for a Customerlink.
I'm curious to know how a 'Customerlink' works on the exchange. Surely Telecom could 'Customerlink' you to your new exchage (On a dummy number in that exchanges range) and set your outbound CID to your existing number? What they charge for their CustomerLink service is very high considering you could do the same thing with a VoIP line for less than 1/4 the cost.
Customerlink is simply a permanent call forward. Outbound CID will be the number associatd with the line you're on, it can't be set to the Customerlink number.