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Linksys includes the four line upgrade for free with firmware versions 5.1.8 and newer.
Upgrade your existing Linksys / Sipura 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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