“Disable”.
SRTP Key Length
Configures all the AES (Advanced Encryption Standard) key size within SRTP. It can be selected from
dropdown list:
● AES128 & 256 bit
● AES 128 bit
● AES 256 bit
If it is set to “AES 128 & 256 bit”, the phone system will provide both AES 128 and 256 cipher suite for
SRTP. If set to “AES 128 bit”, it only provides 128-bit cipher suite; if set to “AES 256 bit”, it only provides
256-bit cipher suite. The default setting is “AES128&256 bit”.
Enable SRTP Key
Lifetime
Defines the SRTP key lifetime. When this option is set to be enabled, during the SRTP call, the SRTP key
will be valid within 231 SIP packets, and phone will renew the SRTP key after this limitation. Default is
“Yes”.
RTCP Destination Configures a remote server URI where the RTCP messages will be sent to during an active call.
Symmetric RTP
Configures if the phone system enables the symmetric RTP mechanism.
If it is set to “Yes”, the phone system will use the same socket/port for sending and receiving the RTP
messages. The default setting is “No”.
RTP IP Filter
Receives the RTP packets from the specified IP address and Port by communication protocol. If it is set to
“IP Only”, the phone only receives the RTP packets from the specified IP address based on the
communication protocol; If it is set to “IP and Port”, the phone will receive the RTP packets from the
specified IP address with the specified port based on the communication protocol. The default setting is
“Disable”.
RTP Timeout Timer (s) Disconnects the call automatically when there is no RTP stream for a specific timeout. Default is 30 seconds.
VQ RTCP-XR Collector
Name
Configures the host name of the RTCP server that accepts voice quality reports contained in SIP PUBLISH
messages.
VQ RTCP-XR Collector
Address
Configures IP address of the RTCP server that accepts voice quality reports contained in SIP PUBLISH
messages.
VQ RTCP-XR Collector
Port
Configures the port of the RTCP server that accepts voice quality reports contained in SIP PUBLISH
messages.
SRTP Mode
Sets if the phone system will enable the SRTP (Secured RTP) mode. It can be selected from
dropdown list:
● Disable
● Enabled but not forced
● Enabled and forced
SRTP uses encryption and authentication to minimize the risk of denial of service. (DoS). If the
server allows to use both RTP and SRTP, it should be configured as “Enabled but not forced”. The
default setting is “Disable”.
SRTP Key Length Configures all the AES (Advanced Encryption Standard) key size within SRTP. It can be selected
from dropdown list:
● AES128&256 bit
● AES 128 bit
● AES 256 bit
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