Grandstream Networks DUAL FXS PORT HT502 User Manual page 42

Session Expiration
Min-SE
Caller Request Timer
Callee Request Timer
Force Timer
UAC Specify Refresher
UAS Specify Refresher
Force INVITE
Send Re-INVITE After
Fax
Enable Silence
Detection for Fax
Disconnect
Enable 100rel
Use First Matching
Vocoder in 200OK SDP
Preferred Vocoder
FIRMWARE VERSION 1.0.6.8
Grandstream implemented SIP Session Timer. The session timer extension enables
SIP sessions to be periodically "refreshed" via a SIP request (UPDATE, or re-INVITE.
Once the session interval expires, if there is no refresh via a UPDATE or re-INVITE
message, the session will be terminated. Session Expiration is the time (in seconds) at
which the session is considered timed out, if no successful session refresh transaction
occurs beforehand. The default value is 180 seconds.
The minimum session expiration (in seconds). The default value is 90 seconds.
If selecting "Yes" the phone will use session timer when it makes outbound calls if
remote party supports session timer.
If selecting "Yes" the phone will use session timer when it receives inbound calls with
session timer request.
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.
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.
Session Timer can be refreshed using INVITE method or UPDATE method. Select
"Yes" to use INVITE method to refresh the session timer.
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.
Enables the use of PRACK (Provisional Acknowledgment) method.
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.
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.
appropriate option in "Choice 1".
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.
HT502 USER MANUAL
The first Vocoder is entered by choosing the
The last Vocoder is entered by choosing the
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