Sorry don't know anything about vdn & vectors , how did we do these in the old days
as I said it's been awhile, mostly now small market, but this customer I've been with since the 1991, Avaya came in & did an upgrade in 2005 ,added PRI's all the personal CO lines were change to DID's , now the just added 2 new CO lines from Verizon to some corporate heads who did not want DID's