2N LiftIP 2.0, Руководство пользователя

Страница: 61 / 119

2N® LiftIP 2.0 User Manual
61 / 119
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IP Address Filter Enabled – enable blocking of SIP packets 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.
Do Not Play Incoming Early Media – disable playing of the incoming audio stream before
the call is answered (early media), which is sent by some PBXs or other devices. A standard
local ringtone will be played instead.
Use MKI in the 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.
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.
External IP Address – set the public IP address or router name to which the device is
connected. If the device IP address is public, leave this parameter empty.
Starting RTP Port – set the starting local RTP port in the range of 64 ports to be used for
audio and video transmissions. The default value is 4900 (i.e. the used range is 4900–
4963). The parameter is only set for account 1 but applies to both the SIP accounts.
RTP Timeout – set the timeout for receiving audio stream RTP packet during a call. If this
limit is exceeded (RTP packets are not delivered), the call will be terminated by the device.
Enter 0 to disable this parameter. The parameter is only set for account 1 but applies to
both the SIP accounts.
Compatibility with Broadsoft Devices – set compatibility with the Broadsoft PBXs. If, in
this mode, the device receives re-invite from a PBX, it responds by repeating the last sent
SDP with the currently used codecs instead of sending a complete offer.
Rotate SRV Records – enable rotation of the SRV records for SIP Proxy and Registrar. This
is an alternative method of transition to backup servers in the event of main server failure
or unavailability.
Calls
Call Time Limit – set a timeout after which the call is automatically terminated. The
device beeps into the call 10 s before the call end to signal the imminent call termination.