Grandstream GXP2200 User Manual - Manual (Page 123)

Firmware Version 1.0.3.26 GXP2200 USER MANUAL Page 122 of 159
will use a session timer when it makes outbound calls. The default
setting is "No".
Callee Request Timer
If set to "Yes" and the remote party supports session timers, the phone
will use a session timer when it receives inbound calls. The default
setting is "No".
Force Timer
If Force Timer is set to "Yes", the phone will use the session timer even if
the remote party does not support this feature. If Force Timer is set to
"No", the phone will enable the session timer only when the remote party
supports this feature. To turn off the session timer, select "No". The
default setting is "No".
Enable 100rel
The use of the PRACK (Provisional Acknowledgment) method enables
reliability to SIP provisional responses (1xx series). This is very
important in order to support PSTN internet working. To invoke a reliable
provisional response, the 100rel tag is appended to the value of the
required header of the initial signaling messages. The default setting is
"No".
Use Privacy Header
Controls whether the Privacy Header will present in the SIP INVITE
message or not. The default setting is "default", which is when "Huawei
IMS" special feature is on, the Privacy Header will not show in INVITE. If
set to "Yes", the Privacy Header will always show in INVITE. If set to
"No", the Privacy Header will not show in INVITE. The default setting is
"Default".
Use P-Preferred-Identity
Header
Controls whether the P-Preferred-Identity Header will present in the SIP
INVITE message or not. The default setting is "default", which is when
"Huawei IMS" special feature is on, the P-Preferred-Identity Header will
not show in INVITE. If set to "Yes", the P-Preferred-Identity Header will
always show in INVITE. If set to "No", the P-Preferred-Identity Header
will not show in INVITE. The default setting is "Default".
SIP Transport
Determines the network protocol used for the SIP transport. Users can
choose from TCP/UDP/TLS.
Symmetric RTP
Defines whether symmetric RTP is supported or not. The default setting
is "No".
Support SIP Instance ID
Defines whether SIP Instance ID is supported or not. The default setting
is "Yes".
Validate Incoming SIP
Messages
Defines whether the incoming messages will be validated or not. The
default setting is "No".
Authenticate Incoming INVITE
If set to "Yes", the phone will challenge the incoming INVITE for
authentication with SIP 401 Unauthorized response. The default setting