Grandstream Networks HT503 User Manual page 36

G723 Rate
iLBC Frame Size
iLBC Payload Type
AAL2-G726-16 Payload
Type
AAL2-G726-24 Payload
Type
AAL2-G726-32 Payload
Type
AAL2-G726-40 Payload
Type
G729E Payload Type
VAD
Symmetric RTP
Fax Mode
Fax Tone Detection
Mode
Jitter Buffer Type
Jitter Buffer Length
SRTP Mode
SLIC Setting
Called ID Scheme
Caller ID TX Level (dB)
Polarity Reversal
Loop Current Disconnect
Loop Current Disconnect
Duration
Hook Flash Timing
FIRMWARE VERSION 1.0.6.8
(2 x10ms)
If the configured voice frames per TX exceeds the maximum allowed value, the ATA
will not accept it and will use and save the precedent configured allowed value for the
corresponding first vocoder choice.
This defines the encoding rate for G723 vocoder. Default setting is 6.3kbps.
This sets the iLBC size in 20ms or 30ms
This defines payload type for iLBC. Default value is 97. The valid range is between 96
and 127.
Defines payload type for AAL2-G726-16. Default value is 100. Range is from 96 to
127.
Defines payload type for AAL2-G726-24. Default value is 99. Range is from 96 to 127.
Defines payload type for AAL2-G726-24. Default value is 104. Range is from 96 to
127.
Defines payload type for AAL2-G726-40. Default value is 103. Range is from 96 to
127.
Defines payload type for G729E. Default value is 102. Range is from 96 to 127
Default is No. VAD allows detecting the absence of audio and conserves bandwidth by
preventing the transmission of "silent packets" over the network.
Default is No. When set to "Yes" the device will change the destination to send RTP
packets to the source IP address and port of the inbound RTP packet last received by
the device.
T.38 (Auto Detect) FoIP by default, or fax Pass-Through (must use PCMU/PCMA)
Default is Callee. This decides whether Caller or Callee sends out the re-invite for T.38
or Fax Pass-Through.
Select either Fixed or Adaptive based on network conditions.
Select Low, Medium, or High based on network conditions.

High (initial 200ms, min 40ms, max 600ms) Note: not all vocoders can meet
the high requirement

Medium (initial 100ms, min 20ms, max 200ms)
Low (initial 50ms, min 10ms, max 100ms)
Secure RTP protocol used for media transmission over VoIP. Disabled by default.
Other modes are: enabled but not forced & enabled and forced.
Dependent on standard phone type (and location).
Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan
A value of level for Caller ID information sent by a FXS port to phone connected to it.
(-40 – 0dB. Default -20dB)
If set to "Yes", polarity will be reversed upon call establishment and termination.
Default is No.
Set it to "Yes" of the traditional PBX you are using with HT503 uses this method for
signaling call termination. Default is No.
A configurable period of time in which the FXS port will drop off voltage on the line to
indicate to the local party that the call is disconnected from the remote side.
(100-10000 ms. Default 200 ms)
The time period when the cradle is pressed (Hook Flash) to simulate a FLASH. Adjust
this time value to prevent unwanted activation of the Flash/Hold and automatic phone
ring-back.
HT503 USER MANUAL
Page 36 of 48