Grandstream HT503 User Manual - Manual (Page 56)

FIRMWARE VERSION 1.0.14.1 HT503 USER MANUAL Page 54 of 64
or G726, then the “ptime” value in the SDP message of an INVITE request will be 20ms
(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.
G723 Rate: This defines the encoding rate for G723 vocoder. Default setting is 6.3kbps.
iLBC Frame Size: This sets the iLBC size in 20ms or 30ms
iLBC Payload Type: This defines payload type for iLBC. Default value is 97. The valid range is between 96
and 127.
AAL2-G726-16 Payload
Type
Defines payload type for AAL2-G726-16. Default value is 100. Range is from 96 to
127.
AAL2-G726-24 Payload
Type
Defines payload type for AAL2-G726-24. Default value is 99. Range is from 96 to 127.
AAL2-G726-32 Payload
Type
Defines payload type for AAL2-G726-24. Default value is 104. Range is from 96 to
127.
AAL2-G726-40 Payload
Type
Defines payload type for AAL2-G726-40. Default value is 103. Range is from 96 to
127.
VAD Default is No. VAD allows detecting the absence of audio and conserves bandwidth by
preventing the transmiss ion of “silent packets” over the network.
Symmetric RTP 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.
Fax Mode T.38 (Auto Detect) FoIP by default, or fax Pass-Through (must use PCMU/PCMA)
Fax Tone Detection Mode Default is Callee. This decides whether Caller or Callee sends out the re-invite for T.38
or Fax Pass-Through.
Jitter Buffer Type Select either Fixed or Adaptive based on network conditions.
Jitter Buffer Length Select Low, Medium, or High based on network conditions.
SRTP Mode Secure RTP protocol used for media transmission over VoIP. Disabled by default.
Other modes are: enabled but not forced & enabled and forced.
Crypto Life Time Default is Enabled. Allows user to enable or disable Crypto life time when using SRTP.
Caller ID Scheme Bellcore/Telcordia, ETSI-FSK, ETSI-DTMF, SIN 227 – BT, & NTT Japan
FSK Caller ID minimum
RX Level (dB)
An adjustable value for the Caller ID signal to help this device to recognize Caller ID
from different networks. (-96 -0dB. Default -40dB)
FSK Caller ID Seizure
Bits
Default is: 70bits. Range is from 0 to 800bits.
FSK Caller ID mark bits Default is: 40bits. Range is from 1 to 800bits.