Grandstream HT503 User Manual User Manual
Page 48
FIRMWARE VERSION 1.0.14.1
HT503 USER MANUAL
Page 46 of 64
occurs beforehand. The default value is 180 seconds.
Min-SE
The minimum session expiration (in seconds). The default value is 90 seconds.
Caller Request Timer
If selecting “Yes” the phone will use session timer when it makes outbound calls if
remote party supports session timer.
Callee Request Timer
If selecting “Yes” the phone will use session timer when it receives inbound calls with
session timer request.
Force Timer
If selecting “Yes” the phone will use session timer even if the remote party does not
support this feature. Selecting “No” will allow the phone to enable session timer only
when the remote party support this feature.
To turn o
ff Session Timer, select “No” for Caller Request Timer, Callee Request Timer,
and Force Timer.
UAC Specify Refresher
As a Caller, select UAC to use the phone as the refresher, or UAS to use the Callee or
proxy server as the refresher.
UAS Specify Refresher
As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to use
the phone as the refresher.
Send Re-INVITE After
Fax
Default is No
, If set to “Yes”, device will send an INVITE with audio vocoders upon
completition 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
The use of the PRACK (Provisional Acknowledgement) method enables reliability to be
offered to SIP provisional responses (1xx series). This is very important if PSTN inter-
networking is to be supported. A
user’s request to use reliable provisional responses is
invoked by the 100rel tag which is appended to the value of the required header of
initial signaling messages.
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.
Force INVITE
Session Timer can be refreshed using INVITE method or UPDATE method. Select
“Yes” to use INVITE method to refresh the session timer.
Preferred Vocoder
The HT503 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 and iLBC. 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”.
Voice Frames per TX
This field contains the number of voice frames to be transmitted in a single packet.
When setting this value, the user should be aware of the requested packet time (used
in SDP message) as a result of configuring this parameter. This parameter is