Grandstream Networks GXP2130 Administration Manual page 39

Accept Incoming SIP
from Proxy Only
Authenticate Incoming
INVITE
Account x -> Audio Settings
Send DTMF
DTMF Payload Type
Preferred Vocoder
Use First Matching
Vocoder in 200OK SDP
SRTP Mode
Symmetric RTP
Silence Suppression
Voice Frames Per TX
GXP2130/GXP2140/GXP2160
FIRMWARE VERSION 1.0.4.16
When set to "Yes", the SIP address of the Request URL in the incoming SIP
message will be checked. If it doesn't match the SIP server address of the
account, the call will be rejected. The default setting is "No".
If set to "Yes", the phone will challenge the incoming INVITE for
authentication with SIP 401 Unauthorized response. The default setting is
"No".
This parameter specifies the mechanism to transmit DTMF digits. There are
3 supported modes: in audio which means DTMF is combined in the audio
signal (not very reliable with low-bit-rate codecs), via RTP (RFC2833), or via
SIP INFO.
• In audio, which means DTMF is combined in the audio signal (not very
reliable with low-bit-rate codecs);
• RFC2833, which means to specify DTMF with RTP packet. Users could
know the packet is DTMF in the RTP header as well as the type of DTMF;
• SIP INFO, which use SIP info to carry DTMF. The defect of this mode is
that it's easily to cause desynchronized of DTMF and media packet for the
reason the SIP and RTP are transmitted respectively. The default setting is
"RFC2833".
This parameter sets the payload type for DTMF using RFC2833. Default is
101. The valid range is from 96 to 127.
Multiple vocoder types are supported on the phone, the vocoders in the list
is a higher preference. Users can configure vocoders in a preference list that
is included with the same preference order in SDP message.
When set to "Yes", the device will use the first matching vocoder in the
received 200OK SDP as the codec. The default setting is "No".
Enable SRTP mode based on your selection from the drop-down menu. The
default setting is "Disabled".
Defines whether symmetric RTP is supported or not. The default setting is
"No".
Controls the silence suppression/VAD feature of the audio codec G.729. If
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
GXP2130/GXP2140/GXP2160
ADMINISTRATION GUIDE
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