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RJ-11 jack for console access (labeled AUX or RS232)
RS-232 or AUX port is used to connect to the7914 Expansion module, I dont think connecting anything else supported.
Some info about other devices that could be connected to AUX port you can find in "Lantronix Application Extension SDK for Cisco IP Phones.doc" delivered in IP Phones Services SDK.
Read this Link
