2N Helios IP Configuration Manual page 9

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You can also use the 2N Helios IP intercom with one or more IP phones without a
SIP server. Use the Direct SIP Call for outgoing calls and enter the called phone SIP
address ( sip:phone_number@phone_ip_address ) instead of the phone number.
Electric Lock Switching Settings
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An electric lock can be attached to the 2N Helios IP intercoms and controlled by a
code from the intercom numeric keypad, or a code from the IP phone keypad during a
call. Connect the electric lock as instructed in the Installation Manual of your intercom
model.
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2N TELEKOMUNIKACE a.s., www.2n.cz