2N Helios IP, Руководство по настройке

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Send KeepAlive packets – define whether the intercom shall, during a call, send
periodical SIP OPTIONS requests to inquire about the state of the called station
(to detect the station failure, e.g.).
IP address filter enabled – enable the blocking of SIP packet receiving from
addresses other than SIP Proxy and SIP Registrar. The primary purpose of the
function is to enhance communication security and eliminate unauthorised
phone calls.
QoS DSCP value – set the SIP packet priority in the network. The set value is
sent in the TOS (Type of Service) field in the IP packet header. Value is entered
in decimal format. The parameter is not applied until the intercom is restarted.
Starting RTP port – set the starting local RTP port in the range of the length of
60 ports to be used for audio and video transmissions. The default value is 5000
(i.e. the used range is 5060–5059). The parameter is only set for account 1 but
applies to both the SIP accounts.
set the public IP address of the router to which your External IP address –
intercom is connected. If the intercom IP address is public, leave this field blank.
RTP timeout – set the audio stream RTP packet receiving timeout during a call. If
this limit is exceeded (RTP packets are not delivered), the call is terminated by
the intercom. Set the parameter to 0 to disable this function. The parameter is
only set for account 1 but applies to both the SIP accounts.
Calls
Call answering mode – set the incoming call receiving mode: - the Always Busy
intercom rejects incoming calls, - the intercom alerts incoming calls and Manual
the user answers them using a numeric keypad button, and - the Automatic
intercom answers incoming calls automatically. You can set the call receiving
mode for each SIP account separately.