User Guide

Grandstream Networks, Inc. HT-502 User Manual Page 27 of 32
Firmware Version 1.0.4.2 Last Updated: 06/2011
Anonymous Call
Rejection
Default is No. If set to Yes, incoming calls with anonymous Caller ID will be rejected
with 486 Busy message.
Special Feature Default is Standard. Choose the selection to meet some special requirements from
Softswitch vendors.
Session Expiration
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.
Min-SE
The minimum session expiration (in seconds). The default value is 90 seconds.
Caller Request Time
r
If selecting “Yes” the phone will use session timer when it makes outbound calls if
remote party supports session timer.
Callee Request Time
r
If selecting “Yes” the phone will use session timer when it receives inbound calls with
session timer request.
Force Time
r
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 Refreshe
r
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 Refreshe
r
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.
Send Re-INVITE After
Fax
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.
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.
Preferred Vocode
r
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. 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”.
Vocoder types can also be changed per call basis by using a star code. Please see the
“Call features” section.
G723 Rate Default is 6.3kbps. Defines the encoding rate for G.723 vocoder.
iLBC Frame Size
Sets the iLBC frame size in 20ms or 30ms
iLBC Payload type
Defines payload type for iLBC. Default value is 97. The valid range is between 96 and
127.
AAL2-G726-16 Payload
type
Default value is 100. Range is from 96 to 127.
AAL2-G726 - 24
Payload type
Default value is 99. Range is from 96 to 127.
AAL2-G726 - 32
Payload type
Default value is 104. Range is from 96 to 127.
AAL2-G726 - 40
Payload type
Default value is 103. Range is from 96 to 127.
G729E payload type
Default value is 102. Range is from 96 to 127.