Accept Sip Trust Server Only; Accept Sip Trust Server Only Configuration; 100 Reliable Retransmission - Yealink SIP-T2 Series Administrator's Manual

Barge In
l
Retrieve
l
Call Park
l
Group Park
l
Call Pull
l
Permitted
0-Disabled
1-Enabled
Values
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. If 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
It enables or disables the IP phone to only accept the SIP message from the SIP and outbound proxy
server.
Description
Note: If you want to reject the call from IP address, make sure "features.direct_ip_call_enable" is set to 0
(Disabled).
0-Disabled
Permitted
Values
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 the reliability of provisional responses. When presenting in a Supported
header, it indicates that the IP phone can send or receive reliable provisional responses. When presenting in a Require
header in a reliable provisional response, it indicates that the response is to be sent reliably.
Example of a SIP INVITE message:
INVITE sip:1024@pbx.test.com:5060 SIP/2.0
Via: SIP/2.0/UDP 10.3.6.197:5060;branch=z9hG4bK1708689023
From: "1025" <sip:1025@pbx.test.com:5060>;tag=1622206783
To: <sip:1024@pbx.test.com:5060>
Call-ID: 0_537569052@10.3.6.197
<y0000000000xx>.cfg
General Features
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