How to Solve Ghost Call via Web GUI on V73 and V80 Version
Last modified date: 2017/03/07 views: 5068
Description

The following are describes from our customer:

We have large deployments of Yealink T20 phones where individual phones are running off of individual home networks. Lately we have been seeing a large increase of what we are calling "ghost calls". This seems to be the end result of hackers port scanning known VOIP ports. The caller ID will say "100" or "1000" and ring the phone constantly, usually at night, and when they pick it up there is no one there.

 

Cause

There are two causes will lead to this issue.
1.       The phone is attacked by SIP packet of the third party.
2.
       The phone receive the call from other PBX server. 

 

Resolution

1.For commercial firmware which the third number of the firmware is 0 like x.x.0.x, please upgrade the firmware to V73 or V80 version firstly and then reset to test again.

For how to upgrade and reset the firmware of the phone, please refer to below FAQ :

http://support.yealink.com/faq/faqInfo?id=9 

You can download rom file and corresponding files from our official website.

Yealink Support Download

If you are using a customer firmware which the third number of the firmware is NOT 0 like x.x.8.x, please describe your firmware number in detail and then contact with support@yealink.com or support.usa@yealink.com directly! 

2.After upgrading, access to web GUI->Features-> General Information tab, set the “allow IP call” value to “disabled”. Click confirm button to accept the change.

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3.In V73 version: Access to web GUI->Account->Advanced tab, set the “Accept SIP Trust Server Only” value to “Enabled”.  Click confirm button to accept the changes. One point need to be attentive, as in V73 version, this parameter is under Account option, so please note to  enable the SIP Trust parameter of corresponding accounts.

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4.In V80 version: Access to Features->Generally Information, set the “Accept SIP Trust Server Only” value to “Enabled”.  Click confirm button to accept the changes.
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More Information


You can also set these parameters via auto provision (W52P can only be configured through auto provision):

 

For V73 Version:

#!version:1.0.0.1

##Enables or disables the IP phone to only accept the SIP message from the SIP and outbound proxy server.0-Disabled (default), 1-Enabled

##The x of the parameter "account.x.sip_trust_ctrl " ranges from 1 to max accounts. For example, x ranges from 1 to 2 of T20.

##When you want to enable this sip trust control for account 1, fill 1 to “account.1.sip_trust_ctrl”.

 account.X.sip_trust_ctrl=1 

 

##Enable or disable the phone to dial the IP address directly; 0-Disabled, 1-Enabled (default);

features.direct_ip_call_enable = 0

 

For V80 Version:

#!version:1.0.0.1

##Enables or disables the IP phone to only accept the SIP message from the SIP and outbound proxy server.0-Disabled (default), 1-Enabled

sip.trust_ctrl=1

##Enable or disable the phone to dial the IP address directly; 0-Disabled, 1-Enabled (default);

features.direct_ip_call_enable = 0

 

 If there are any other questions, please feel free to contact with support@yealink.com or support.usa@yealink.com.


Product Type
SIP VP-T49G , SIP-T48G , SIP-T46G , SIP-T42G , SIP-T41P , SIP-T40P , SIP-T29G , SIP-T27P , SIP-T23G , SIP-T23P , SIP-T21P E2 , SIP-T19P E2 , W52P , W56P , SIP-T28P , SIP-T26P , SIP-T22P , SIP-T21P , SIP-T20P
Version
V73 and V80
200/200
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