2N Helios IP Configuration Manual v2.8 User Manual

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Trusted certificate – specify one of the three sets of certificates issued by
certification authorities to verify the SIP server public certificate validity, refer to
the Certificates subsection. If none is included, the SIP server public certificate is
not verified.
User certificate – specify the user certificate and private key to verify the
intercom authorisation to communicate with the SIP server. There are three sets
of user certificates and private keys, refer to the Certificates subsection.
Local SIP port – set the local port to be used for SIP signalling. The parameter
is not applied until the intercom is restarted. The default value is 5060.
PRACK enabled - enable the PRACK method for reliable confirmation of SIP
messages with codes 101 - 199

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.
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.

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

Automatic answer – enable automatic answering of incoming calls. If this
function is disabled, the intercom signals incoming calls by ringing and the user
can answer them by pushing the * button on the numeric keypad.
Call activation – select automatic or manual microphone, speaker or camera
activation during an incoming call. The parameter is applied only if the

is enabled. If you select manual activation, enter the

Automatic Answer
activation code, see below.
Activation code – enter the call activation code via the IP phone numeric
keypad to activate the microphone, speaker and camera if available. The
parameter is applied only if the manual call activation is enabled.