Settings/Sip/Codec - Grandstream Networks GVC3200 Administration Manual

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SIP T1 Timeout
SIP T2 Timeout
Remove OBP from
Route
Check Domain
Certificates
Domain Certificate

SETTINGS/SIP/CODEC

Parameters
DTMF
DTMF Payload
Type
Preferred Vocoder
Firmware Version 1.0.1.48
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It is used to define an estimate of the round trip time of transactions between a client
and server. If no response is received in T1, the figure will increase to 2*T1 and then
4*T1. The request re-transmit retries would continue until a maximum amount of
time define by T2. The default setting is 0.5 second.
It is used to define the maximum retransmit time of any SIP request messages
(excluding the SIP INVITE message). The re-transmitting and doubling of T1
continues until it reaches the T2 value. The default setting is 4 second.
It is used to set if the device will remove outbound proxy URI from the Route header.
This is used for the SIP Extension to notify the SIP server that the device is behind a
NAT/Firewall. If it is set to "Yes", it will remove the Route header from SIP requests.
The default setting is "No".
It is used to set if the device will check the domain certificates if TLS/TCP is used for
SIP Transport. The default setting is "No".
It is used to configure the certificate for Authentication, and the option "Check
Domain certificates" needs to be set to "Yes".
Descriptions
It is used to set the parameter to specify the mechanism to transmit DTMF (Dual
Tone Multi-Frequency) signals. There are 3 supported modes: in audio, RFC2833,
or SIP INFO.

In audio
DTMF is combined in the audio signal (not very reliable with low-bit-rate
codecs).

RFC2833
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
Use SIP INFO to carry DTMF. The disadvantage of this mode is that it's easy to
cause desynchronized of DTMF and media packet if the SIP and RTP
messages are required to transmitted respectively.
The default setting is "RFC2833".
It is used to configure the RTP payload type that indicates the transmitted packet
contains DTMF digits. The valid range is from 96 to 127. The default setting is "101".
It lists the available and enabled audio codecs for this account. Users can enable
the specific audio codecs by moving them to the Selected box and set them with a
priority order from top to bottom. This configuration will be included with the same
preference order in the SIP SDP message. The codec option includes "PCMU",
"PCMA", "Opus", "G.722", and "G.722.1".
GVC3200/GVC3202 Administration Guide Page 42 of 71