Yealink T27G

General Features
517
Group Pick up
Barge In
Retrieve
Call Park
Group Park
Call Pull
Permitted
Values
0-Disabled
1-Enabled
Default
0
Web UI
Features->General Information->Hide Feature Access Codes
Accept SIP Trust Server Only
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, and so on. It you enable this feature, the IP phone cannot accept an IP address call.
Topic
Accept SIP Trust Server Only Configuration
Accept SIP Trust Server Only Configuration
The following table lists the parameters you can use to configure accept SIP trust server only.
Parameter
sip.trust_ctrl
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to only accept the SIP message from the SIP and
outbound proxy server.
Note: If you want to reject the call from IP address, make sure
“features.direct_ip_call_enable” is set to 0 (Disabled).
Permitted
Values
0-Disabled
1-Enabled
Default
0
Web UI
Features->General Information->Accept SIP Trust Server Only
100 Reliable Retransmission
As described in RFC 3262, 100rel tag is for reliability of provisional responses. When presenting in a