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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.
•
Receive encrypted calls only (SRTP) – set that SRTP encrypted calls shall only be
received on this account. Unencrypted calls will be rejected. At the same time, TLS is
recommended as the SIP transport protocol for higher security.
•
Encrypted outgoing calls (SRTP) – set that outgoing calls shall be SRTP encrypted on this
account. At the same time, TLS is recommended as the SIP transport protocol for higher
security.
•
Use MKI in SRTP Packets – enable the use of MKI (Master Key Identifier) if required by the
counterparty for master key identification when multiple keys rotate in the SRTP packets.
•
Do Not Play Incoming Early Media – disable playing of the incoming audio stream before
call pick-up (early media), which is sent by some PBXs or other devices. A standard local
ringtone is played instead.
•
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.
•
External IP address – set the public IP address or name of the router to which your
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.
•
Compability with Braodsoft device – Set the Broadsoft PBX compatibility mode. Having
received re-invite from a PBX in this mode, the intercom replies by repeating the last sent
SDP with currently used codecs instead of sending a complete offer.
•
Rotate SVR record – Allow SRV record rotation for SIP Proxy and Registrar. This is an
alternative method of transition to backup servers in the event of main server failure or
unavailability.
Caution
•
To use the NAPTR / SRV DNS query, cancel the Proxy/Registrar port setting.
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