An EL can transmit on-site phone data to any off-premise computer providing that an internet connection is available. Assume that the EL is connected to a LAN along with a router providing internet access. When a packet sent by the EL specifies an external IP address, the local router transmits it to the remote destination gateway. The port number contained within the packet will be used to direct it to the correct computer on the remote network.
To accomplish this remote transmission, the EL and the remote router will need to be configured very specifically. The EL should be set to the following parameters:
The destination MAC address will be the MAC address of the local router
The destination IP address will be the static IP address assigned to the remote destination. This address can be easily determined by accessing the “What is my IP dot com” website (www.WhatIsMyIP.com) from the remote computer.
The port number set in the EL must match the port number within the remote router programmed to direct that port number to the destination computer. The default port number of 3520 is recommended. Any four digit (in Hex) port number not being used by another application can be employed, but port numbers between 0 and 1023 are reserved for special use.
Most routers contain a “redirection table” which allows it to direct incoming packets to a particular computer. This is accomplished by evaluating the port number within a packet, and based on the redirection table, sending the packet to the proper device. An additional entry would be programmed into the remote router to direct packets with the port number (i.e. 3520) to the receiving computer. Of course, this computer would have suitable software loaded set to the correct port number to accept and read these packets.
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