A mobile device can be assigned to an extension configured as a Queue Agent (QA) in a call-queuing enabled virtual private branch exchange (vPBX). This and other mobile or fixed devices can be interconnected to form a virtual call center. Each extension can be assigned various rules, which specify how the incoming calls are answered at the extension and how calls in the call queue are selected for answering by the QA. As part of the rules, the vPBX system forwards calls from a call queue to the QA based on QA's availability status. If a location-aware mobile device is associated with the QA, the vPBX system can determine the QA's availability status based on a geographic location of the mobile device. A most geographically proximate agent can be selected for answering the call.

Certain implementations of the disclosed technology include systems and methods for determining a reachability score of a phone number. A method includes receiving personally identifiable information associated with the subject; querying one or more public or private databases with the personally identifiable information; receiving, in response to the querying, phone number information related to the personally identifiable information; extracting, from the phone number information, one or more phone numbers associated with the subject; determining, with one or more computer processors, based at least in part on the one or more phone numbers, a phone type corresponding to the respective one or more phone numbers; determining, with the one or more computer processors, a reachability score for at least one of the one or more phone numbers, wherein the reachability score is based, at least in part, on the phone type; and outputting an indication of the reachability score.