Grandstream HT503 User Manual - Manual (Page 55)

FIRMWARE VERSION 1.0.14.1 HT503 USER MANUAL Page 53 of 64
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 off 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.
Force INVITE Session Timer can be refreshed using INVITE method or UPDATE method. Select
“Yes” to use INVITE method to refresh the session timer.
Invite Ring-No-Answer
Timeout
Default is 40 seconds, the range is between 5 and 300 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 signalling messages.
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 frame 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
associated with the first vocoder in the above vocoder Preference List or the actual
used payload type negotiated between the 2 conversation parties at run time.
Default is 2, from 1 to 4 for G711/G726/G729 only
For example, if this field is set to be 2 and if the first vocoder chosen is G729 or G711