Grandstream Networks, Inc. GXP User Manual Page 40 of 44
Firmware 1.2.5.3 Last Updated: 03/2011
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.
Session Timer can be refreshed using INVITE method or UPDATE method.
Select “Yes” to use INVITE method to refresh the session timer.
PRACK (Provisional Acknowledgment) method enables reliability to SIP
provisional responses (1xx series). This is required to support PSTN inter-
There are 4 uniquely defined ring tones:
• One (1) System Ring Tone: when selected, all calls will ring with system
ring tone.
• Three (3) Customer Ring Tones: when selected, incoming calls from
designated account will play selected ring tone.
Defines how long ring will ring when receiving a call. Default is 60 seconds.
If this parameter is set to “Yes”, the “From” header in outgoing INVITE message
will be set to anonymous, essentially blocking the Caller ID from displaying.
Whether to use “<sip:anonymous@anonymous.invalid>” in the From Header or P-
Asserted-Identity header.
Default is NO. If set to YES, anonymous call will be rejected
Default is No. If set to “Yes”, GXP will automatically switch on speaker to answer
the incoming call. Set to Intercom/Paging mode, it will answer the call based on
the SIP info header from the server.
Allow Auto Answer by
Call-Info
If the Call-Info header contains answer-after=0, the call be answered
automatically (so called paging mode).
Turn off speaker on
remote disconnect
When BYE is received, the phone will turn off its speaker automatically.
Check SIP User ID for
incoming INVITE
Check the SIP User ID in Request URI. If they don’t match, the call will be
rejected.
Refer-To Use Target
Contact
Default is NO. If set to YES, then for Attended Transfer, the “Refer-To” header uses the
transferred target’s Contact header information.
Disable Multiple Media
Default is No.
GXP supports up to 7 different Vocoder types including G.711(a/µ) (also known
as PCMU/PCMA), GSM, G.723.1, G.729A/B, G.726-32, iLBC, G.722 (wide-band).
Configure Vocoders in a preference list that is included with the same preference
order in SDP message. Enter the first Vocoder in this list by choosing the
appropriate option in “Choice 1”. Similarly, enter the last Vocoder in this list by
choosing the appropriate option in “Choice 8”.
Enable SRTP mode based on selection. Default is No.
