Grandstream Networks GHP6 Series - SRTP Mode; SRTP Key Length; Silence Suppression (VAD); Jitter Buffer Type

iLBC Payload type
Default value is97. Defines payload type for iLBC. The valid range is between 96 and
127.
AAL2-G726-16 Payload type Default value is100. Range is from 96 to 127.
AAL2-G726-24 Payload type Default value is99. Range is from 96 to 127.
AAL2-G726-32 Payload type Default value is104. Range is from 96 to 127.
AAL2-G726-40 Payload type Default value is103. Range is from 96 to 127.
Use First Matching Vocoder in 200OK
SDP
Default isNo. If set to “Yes”, device will include only the first match vocoder in its
200OK response, otherwise it will include all match vocoders in same order received
in INVITE.
SRTP Mode
Default isDisabled. Other options areEnabled but not forced, andEnabled and
forced.It uses SDP Security Description to exchange key. Please refer to the
following link
:https://tools.ietf.org/html/rfc4568SRTP:https://datatracker.ietf.org/doc/html/rfc37
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SRTP Key Length
Allow Users to configure the cipher method or key length if SRTP is enabled The
Value of the SRTP Key length can be :
1. AES 128&256 bit
2. AES 128 bit
3. AES 256 bit
By default, it is set to AES 128&256 bit
Crypto Life Time
Default setting isYes. Enable or disable the crypto life time when using SRTP. If
users set to disable this option, phone does not add the crypto life time to SRTP
header.
Silence Suppression (VAD)
Default isNo. VAD allows detecting the absence of audio and conserve bandwidth by
preventing the transmission of “silent packets” over the network.
Jitter Buffer Type Select either Fixed or Adaptive based on network conditions.
Jitter Buffer Length
Select Low, Medium or High based on network conditions.High(initial 200ms, min
40ms, max 600ms) Note: not all vocoders can meet the high
requirementMedium(initial 100ms, min 20ms, max 200ms)Low(initial 50ms, min
10ms, max 100ms)
RTCP
With this feature enabled, the device will send RTCP Sender Report during the
conversation until it’s ended.
SLIC Setting Depends on standard phone type (and location)
Ringing Frequency This feature allows to customize ringing frequency.
Caller ID Scheme
Select the value according to the local Telco standard where the GXW42XX is
installed.Please refer to the pull-down list to select.
Polarity Reversal
Default isNo. If set to “Yes”, polarity will be reversed upon call establishment and
termination.
Loop Current Disconnect
Set to Yes if the traditional PBX you are using with GXW42XX uses this method for
signaling call termination. Default isNo.
Play busy/reorder tone before Loop
Current Disconnect
Default isNo. If set to yes, it will play busy/reorder tone before loop current
disconnect upon call fail.
Loop Current Disconnect duration Default is200.In 100 – 10000 milliseconds range.
Enable Hook Flash If no, flash will be treated as an on-hook event.
Hook Flash timing(Minimum)/
(Maximum)
Sets the minimum/maximum time the phone is on hook before being detected as a
hook flash. The range is 40 to 2000 milliseconds
On Hook Timing Sets the time required to detect that the phone is on hook. The range is 40 to 2000