Yealink T40G Administrator's Guide

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

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries