How does telco routing work? This topic has 0 replies, 1 voice, and was last updated 20 years, 1 month ago by Todd. Viewing 1 post (of 1 total) Author Posts 12th February 2005 at 10:46 #28978 ToddGuest Ok, so all area numbers are assigned to an exchange, and CO. xxx-yyy If I move that number to a VoIP provider, where is that change in routing made? Is there a “backbone” router with a routing entry for my measly little entry just for my measly little phone #? Author Posts Viewing 1 post (of 1 total) The forum ‘Voice over IP’ is closed to new topics and replies.