Grandstream Networks HT503 User Manual page 43

UAC Specify Refresher
UAS Specify Refresher
Send Re-INVITE After
Fax
Enable Silence
Detection for Fax
Disconnect
Enable 100rel
Use First Matching
Vocoder in 200OK SDP
Force INVITE
Preferred Vocoder
Voice Frames per TX
FIRMWARE VERSION 1.0.9.1
As a Caller, select UAC to use the phone as the refresher, or UAS to use the Callee or
proxy server as the refresher.
As a Callee, select UAC to use caller or proxy server as the refresher, or UAS to use
the phone as the refresher.
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.
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.
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.
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.
Session Timer can be refreshed using INVITE method or UPDATE method. Select
"Yes" to use INVITE method to refresh the session timer.
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".
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
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.
HT503 USER MANUAL
Page 43 of 59