Systems and methods for intelligently routing an incoming telephone call to an internal extension based on the calling history are provided. According to one embodiment, a session log, containing information regarding sessions between internal extension numbers and external telephone numbers, is maintained by a call monitor of a telephone system. The internal extension numbers are associated with telephone extensions within the telephone system and the external telephone numbers are associated with telephones outside of the telephone system. An incoming telephone call is received by the call monitor from a telephone outside the telephone system that is associated with an external telephone number. It is determined by the call monitor whether the incoming call represents a call-back to an internal extension number based on the session log. When the incoming call is determined to represent a call-back, then causing a switch to route the incoming call to the internal extension number.

Systems and methods for intelligently routing an incoming telephone call to an internal extension based on the calling history are provided. According to one embodiment, a session log is maintained by a call monitor of a telephone system. The session log contains multiple call session records relating to telephone calls between internal extension numbers and external telephone numbers. An incoming telephone call from a telephone external to the telephone system is received by the call monitor. The session log is searched by the call monitor for a call session record corresponding to the external telephone number. When a result of the searching meets one or more predetermined or configurable conditions, then a switch of the telephone system is caused by the call monitor to route the incoming telephone call to one of the internal extension numbers.

A system, method and computer-readable medium for allowing the use of an alternative numbering plan for delivering short messages to mobile subscribers using the public mobile telephone network is provided. Users of an enterprise or other closed networks as well as users that are not part of a closed network may send short messages destined to members of an enterprise or closed network from their mobile or other devices associated with their subscription using an alternative enterprise directory number, such as the office number, instead of the mobile number, such that the alternative number will be presented at the destination device as the originating number. The recipient may respond to the message by addressing the response to the enterprise or closed network number, and the response may be delivered to the originator's mobile or other device associated with their subscription.

A system, method and computer-readable medium for allowing the use of an alternative numbering plan for delivering short messages to mobile subscribers using the public mobile telephone network is provided. Users of an enterprise or other closed networks as well as users that are not part of a closed network may send short messages destined to members of an enterprise or closed network from their mobile or other devices associated with their subscription using an alternative enterprise directory number, such as the office number, instead of the mobile number, such that the alternative number will be presented at the destination device as the originating number. The recipient may respond to the message by addressing the response to the enterprise or closed network number, and the response may be delivered to the originator's mobile or other device associated with their subscription.