Grandstream Networks HT503 User Manual page 61

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
To turn off Session Timer, select "No" for Caller Request Timer, Callee
Request Timer, and Force Timer.
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 completion 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
HT503 User Manual
P a g e | 60