Yealink SIP-T48G

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
260
Accept SIP trust server only enables the IP phones to only accept the SIP message from
your 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 Allow
IP Call on page 258.
Procedure
Accept SIP trust server can be configured using the configuration files or locally.
Configuration File
<y0000000000xx>.cfg
Configure accept SIP trust server.
Parameter:
sip.trust_ctrl
Local
Web User Interface
Configure accept SIP trust server.
Navigate to:
http://<phoneIPAddress>/servlet
?p=features-general&q=load
Details of Configuration Parameters:
Parameters
Permitted Values
Default
sip.trust_ctrl
0 or 1
0
Description:
Enables or disables the IP phone to only accept the SIP message from the SIP 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:
1. Click on Features->General Information.