Method for recognizing location move of VoIP phones
A method is provided for tracking the physical location of IP phones and IP devices in a network. According to the invention, the IP phone or IP device detects its own current location and then informs the PBX controller or the location database to which it is connected. The capability is integrated in every IP phone and IP device. The PBX or location database then takes appropriate action, such as updating the ALI mapping for the phone or location information for the IP device.
1 . In a network having a location database, and a plurality of data switches to which a plurality of IP devices are connected via respective data jacks identified by respective unique port MAC address and port numbers, a method of tracking the physical location of each IP device, comprising:
transmitting packets over the network indicative of device peer connectivity, including said port MAC address and port numbers;
snooping said packets transmitted over the network and capturing therefrom within each said IP device the port MAC address and port number of the switch to which each said IP device is connected; and
communicating said port MAC address and port number from each said IP device to said location database as a result of device registration of each said IP Device with said location database, whereby said location database is apprised of the physical location of each said IP device.
2 . The method of claim 1 , wherein said transmitting is in accordance with a multicast protocol that advertises said port MAC address and port numbers.
3 . The method of claim 2 , wherein said multicast protocol is IEEE 802.1 Spanning Tree Protocol.
4 . The method of claim 2 , wherein said multicast protocol is 802.1ab Link Layer Discovery Protocol.
5 . The method of claim 2 , wherein said multicast protocol is a proprietary vendor global multicast protocol.
6 . The method of claim 1 , wherein said capturing includes parsing said port MAC address and port number from the header of each of said packets.
7 . The method of claim 1 , wherein said querying includes parsing said port MAC address and port number from the header of each of said packets.
8 . The method of claim 1 , further including the steps of maintaining a record of the physical location of each said IP device and in the event of any change in said location generating an information log for invoking appropriate application specific handling.
9 . The method of claim 8 , wherein at least one of said IP devices is an IP phone, and wherein said location database is incorporated within an iPBX.
10 . The method of claim 9 , wherein said maintaining includes recording IP phone registration data in a database table that maps each iPBX Directory Number (DN) to a corresponding Layer 2 Switch port MAC address and port number.
11 . The method of claim 8 , wherein said maintaining includes recording IP Device registration data in a database table that maps each IP Device identifier to a corresponding Layer 2 switch port MAC address and port number.
12 . The method of claim 10 wherein said iPBX detects a change in said location by comparing a previously stored port MAC address and port number for mapped to a corresponding DN stored in said database to a current port MAC address and port number communicated by said IP phone to said iPBX.
13 . The method of claim 11 wherein said location database detects a change in said location by comparing a previously stored port MAC address and port number for mapped to a corresponding Device identifier stored in said database to a current port MAC address and port number communicated by said IP Device to said location database.
14 . The method of claim 9 , wherein said appropriate application specific handling includes automatically retrieving a new Automatic Location Identifier (ALI) number from a table that maps each of said port MAC address and port numbers to respective ALI numbers, and assigning said new ALI number to each said IP phone that has moved location.
15 . The method of claim 8 , wherein said appropriate application specific handling includes inventory tracking.
16 . The method of claim 9 , wherein said appropriate application specific handling includes location based emergency announcement.
17 . The method of claim 9 , wherein said appropriate application specific handling includes location based voicemail.
18 . The method of claim 9 , wherein said appropriate application specific handling includes location-based call center routing.