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Configuration
Backup Registrar Address – set the backup SIP Registrar IP address or domain name. The address is
used where the main Registrar fails to respond to requests.
Backup Registrar Port – set the backup SIP registrar port (typically 5060).
Registration Expires – set the registration expiry, which affects the network and SIP Registrar load by
periodically sent registration requests. The SIP Registrar can alter the value without letting you know.
Registration State – display the current registration state (Unregistered, Registering..., Registered, Unregi-
stering...).
Failure Reason – display the reason for the last registration attempt failure: the registrar's last error reply,
e.g. 404 Not Found.
Advanced Settings
SIP Transport Protocol – set the SIP communication protocol: UDP (default), TCP or TLS.
Lowest Allowed TLS Version – set the lowest TLS version to be accepted for device connection.
Verify Server Certificate – verify the SIP server public certificate against the CA certificates uploaded in the
device.
Client Certificate – specify the client certificate and private key used for verifying the intercom's authority to
communicate with the SIP server.
Local SIP Port – set the local port for the device for SIP signaling. A change of this parameter will not be
applied until the device is restarted. The default value is 5060.
PRACK Enabled – enable the PRACK method for reliable confirmation of SIP messages with codes 101–
199.
REFER Enabled – enable call forwarding via the REFER method.
Send Keep Alive Packets – set that the device shall inquire periodically about the state of the called station
via SIP OPTIONS requests during the call (used for station failure detection during the call).
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 unauthorized 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 the call sent by
some PBXs or other devices is picked up (early media). 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. Enter the value as a decimal number. A change of this parameter will
not be applied until the device is restarted.
STUN Enabled – enable STUN functionality for the SIP account. Address and ports acquired from the
configured STUN server will be used in SIP headers and SDP media negotiation.
STUN server address – set the IP address of the STUN server that will be used for this SIP account.
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