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Through our extensive Canadian backbone network, Long Distance Systems can provide you with DIDs in over 1000 Canadian cities from Victoria to Newfoundland, throughout the United States, as well as several destinations overseas. We ensures number availability wherever needed. Direct inward dialing service has similar relevance for Voice over Internet Protocol (VoIP) communications. To reach users with VoIP phones, DID numbers are assigned to a communications gateway connected by a trunk to the public switched telephone network (PSTN) and the VoIP network. The gateway routes and translates calls between the two networks for the VoIP user. Calls originating in the VoIP network will appear to users on the PSTN as originating from one of the assigned DID numbers.