Grandstream Networks GSC3570 User Manual page 46

Accept
Incoming
When set to "Yes", the SIP address of the Request URL in the incoming SIP message will be checked. If it does
SIP from
not match the SIP server address of the account, the call will be rejected. The default setting is "No".
Proxy
Only
Authentic
ate If set to "Yes", the GSC3570 will challenge the incoming INVITE for authentication with SIP 401 Unauthorized
Incoming response. Default setting is "No".
INVITE
Account x
�� Codec
Settings
Audio
Settings
Multiple vocoder types are supported on the GSC3570, the vocoders in the list is a higher preference. Users
Preferred
can configure vocoders in a preference list that is included with the same preference order in SDP message.
Vocoder
Use First
Matching
When it is set to "Yes", the device will use the first matching vocoder in the received 200OK SDP as the codec.
Vocoder
The default setting is "No".
in 200OK
SDP
Codec
Configures the GSC3570 to use which codec sequence to negotiate as the callee. When set to "Caller", the
Negotiati
GSC3570 negotiates by SDP codec sequence from received SIP Invite. When set to "Callee", the GSC3570
on
negotiates by audio codec sequence on the GSC3570. Default is "Callee".
Priority
Disable
Multiple When it is set to "No", the device will reply with multiple m lines; Otherwise, it will reply 1 m line. The default
m line in setting is "No".
SDP
SRTP
Enable SRTP mode based on your selection from the drop-down menu. The default setting is "Disabled".
Mode
Allows users to specify the length of the SRTP calls. The available options are AES 128&256 bit, AES 128 bit
SRTP Key
and AES 256 bit.
Length
Default setting is AES 128&256 bit
Crypto Enable or disable the crypto lifetime when using SRTP. If users set to disable this option, GSC3570 will not add
Lifetime the crypto lifetime to SRTP header. The default setting is "Yes".
Symmetri
Defines whether symmetric RTP is supported or not. Default setting is "No".
c RTP
Silence Controls the silence suppression/VAD feature of the audio codecs except forG.723 (pending) and G.729. If set
Suppressi to "Yes", a small quantity of RTP packets containing comfort noise will be sent during the periods of silence. If
on set to "No", this feature is disabled. Default setting is "No"