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Reference.org
Location-based routing
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<p>Location-based routing is a system of rules to varying degrees of complexity dictating where inbound <a href="/facts/Telephone_call/4wUtUXpY">telephone calls</a> from various locations are routed to. The location of call origin is normally determined by the outgoing <a href="/facts/Caller_ID/hh9DqEEj">caller ID</a> of the caller but can also be determined by <a href="/facts/Global_Positioning_System/DKVLnzF3">GPS position</a> or <a href="/facts/Signal/41YqUJ8c">signal</a> <a href="/facts/Triangulation/lpmlmhGd">triangulation</a>, the latter being particularly useful for calls coming from <a href="/facts/Mobile_phone/H3EcqD9h">mobile phones</a>. </p>