Yealink SIP-T54S Administrator's Manual page 422

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
SIP server and outbound proxy server. It can prevent the phone receiving ghost calls from
random numbers like 100, 1000, etc. To stop this from happening, you also need to disable
allow IP call feature. For more information on allow IP call, refer to
Procedure
Accept SIP trust server only can be configured using the following methods.
Central Provisioning
(Configuration File)
Web User Interface
Details of Configuration Parameter:
sip.trust_ctrl
Description:
Enables or disables the IP phone to only accept the SIP message from the SIP server and
outbound proxy server.
0-Disabled
1-Enabled
Web User Interface:
Features->General Information->Accept SIP Trust Server Only
Phone User Interface:
None
To configure accept SIP trust server only feature via web user interface:
Click on Features->General Information.
1.
396
<y0000000000xx>.cfg
Parameter
Allow IP Call
Configure accept SIP trust server only.
Parameter:
sip.trust_ctrl
Configure accept SIP trust server only.
Navigate to:
http://<phoneIPAddress>/servlet?p=fe
atures-general&q=load
Permitted Values
0 or 1
on page 394.
Default
0