Patent ID: 6252943
Filing Date: 2001-06-26
Classification: H04M

Abstract:
A telephone network configured to route an emergency call between a subscriber telephone and an emergency tandem switch, said telephone network comprising:a first switch having a first link to an emergency tandem switch and at least one connection to a first subscriber telephone;a second switch having a second link to said emergency tandem switch and at least one connection to a second subscriber telephone;a third switch having no link to said emergency tandem switch, said third switch having at least one connection to a third subscriber telephone, said third switch having customer-specific routing information indicative of a location of said third subscriber telephone within a geographical area covered by an area code of said third subscriber telephone; anda switch network configured to route calls between said first, second and third switches; whereinsaid first, second and third switches and said switch network are configured such that upon receipt of an emergency call from said third subscriber telephone, said third switch routes said emergency call to said emergency tandem switch, based at least in part on said customer-specific routing information, via said switch network and also(a) via said first switch and said first link, if said first switch and said first link are available; and(b) via said second switch and said second link, if either said first switch or said first link are not available.