Account - Call Settings; Table 27: Account - Call Settings - Grandstream Networks GAC2500 Administration Manual

SRTP Mode
SRTP Key Length
Enable SRTP key life time
Silence Suppression
Voice Frames per TX
RTCP Destination

Account - Call Settings

Dial Plan Prefix
Disable Dial Plan
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". Default setting is "Disable".
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 suites 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".
Defines the SRTP key life time. 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. The default
setting is "Yes".
Enables the silence suppression/VAD feature. If it is set to "Yes", when
silence is detected, a small quantity of VAD packets (instead of audio
packets) will be sent during the period of no talking. If set to "No", this
feature is disabled. The default setting is "No".
Configures the number of voice frames transmitted per packet. When
configuring this, it should be noted that the "ptime" value for the SDP will
change with different configurations here. This value is related to the
codec used and the actual frames transmitted during the in-payload call.
For end users, it is recommended to use the default setting, as incorrect
settings may influence the audio quality. The default setting is 2.
Configures a remote server URI where the RTCP messages will be sent
to during an active call.

Table 27: Account - Call Settings

Configures the digits prepended to the dialed number.
Enables/disables the Dialplan mechanism for different cases. If the
specific case is checked, the Dialplan mechanism will be disabled.
GAC2500 Administration Guide
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