FAQ/What does "PnP config" on the "Advanced Page" do
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Answer
When "PNP config" is "ON" (by default) the phone sends a SUBSCRIBE message to a multicast address. All setting servers which have membership to the group can respond to the SUBSCRIBE and send NOTIFY messages with the setting server HTTP URL in the body. The phone then retrieves its settings from the link specified.
This is particularly useful for out of the box setup of devices and mass deployment. Please see this Sample SIP Trace for further details.
Links:
Configuration via Web Interface
Sample SIP Trace
Internal phone setting description
