Linksys includes the four line upgrade for free with firmware versions 5.1.10 and newer.
Upgrade your existing Linksys IP phone from two line appearances to four with this software upgrade key.
Once enabled, your phone will function as a four line telephone. The license key permanently upgrades the device, even following a factory reset.
All line upgrades are non-refundable. Once you have placed your order online, we will contact you to obtain the MAC address and serial number of the phone(s).
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