Directory number portability in telephone networks

Abstract From the Canadian patent

Portability of directory numbers in telephone networks particularly so-, called intelligent networks may be provided without modification of the call processing, software at originating network node switches by associating each call to a , ported number with an Initial Address Message comprising a Location Routing Number for the recipient, switch as the Called Number and the ported directory number as the Original Called, Number. At a boundary with a network which uses a Location Routing Number a, Generic Address Parameter and a Forward Call Indicator flag for identifying calls to, ported numbers, a network element creates a modified routing message by converting the, Original Called …