Grandstream HT502 User Manual - Manual (Page 47)

FIRMWARE VERSION 1.0.14.1 HT502 USER MANUAL Page 45 of 54
Force INVITE Session Timer can be refreshed using INVITE method or UPDATE method. Select
“Yes” to use INVITE method to refresh the session timer.
Send Re-INVITE After
Fax
Default is No , If set to “Yes”, device will send an INVITE with audio vocoders upon
completion of Fax to continue session in audio only.
Enable Silence
Detection for Fax
Disconnect
For fax machines that do not send a Disconnect when fax is done. This option
Enables/Disables the detection of silence in order to know the fax has finished. The
silence period is non-configurable and fixed to 7 seconds.
Enable 100rel Enables the use of PRACK (Provisional Acknowledgment) method.
Add Auth Header On
Initial REGISTER
If set to Yes, device will include authorization header in the Register request.
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.
Preferred Vocoder The HT502 supports up to 5 different Vocoder types including G.711 A-/U-law, G.726
(Supports bit rates 16, 24, 32 and 40), G.723.1, G.729A/B/E, iLBC and AAL2. The user
can configure Vocoders in a preference list that will be included with the same
preference order in SDP message. The first Vocoder is entered by choosing the
appropriate option in “Choice 1”. The last Vocoder is entered by choosing the
appropriate option in “Choice 8”.
Vocoder types can also be changed per call basis by using a star code. Please see the
“Call features” section.
Voice Frames per TX Default is 2, from 1 -4 for G711/G726/G729
G723 Rate Default is 6.3kbps. Defines the encoding rate for G.723 vocoder.
iLBC Frame Size Sets the iLBC frame size in 20ms or 30ms
iLBC Payload type Defines payload type for iLBC. Default value is 97. The valid range is between 96 and
127.
AAL2-G726-16 Payload
type
Default value is 100. 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.
G729E payload type Default value is 102. Range is from 96 to 127.
VAD Default is No. VAD allows detecting the absence of audio and conserve bandwidth by
preventing the transmission 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