2N Helios IP Configuration manual v2.6 User Manual
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SIP Transport Protocol – set the SIP communication protocol: UDP (default),
TCP or TLS.
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.
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).
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.