【Basic】How to block ghost call?
Last modified date: 2020/12/22 Views: 33041

Sometimes, the user will receive strange calls which are not from registered SIP server, 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. These are so called ghost calls, it will disturb and confuse the phone user. 


Please disable the Allow IP Call and Enable the Accept SIP Trust Server Only.


1. Disable IP Call feature:

IP Call feature allow the SIP phone to make and receive calls by IP address (Without SIP account)

1.1 Change by WEB UI path: Features->General Information-> Allow IP Call

T32G/T38G can't support configure it through the web UI

1.2 Change by Auto provisioning parameter:

# 0-disable; 1-enable; default value is 1 (Enable)

features.direct_ip_call_enable = 0

2. Enable SIP trust feature:

SIP Trust feature allow the phone to only accept the message from the trusted server for specific account.

2.1 Change by auto provisioning parameter:

# 0-disable; 1-enable; default value is 0 (Disable)

For version lower than V81:

account.X.sip_trust_ctrl = 1

For version higher or equal to V81:

sip.trust_ctrl = 1

2.2 Change by web UI path: (only V73 or higher firmware support. for W52p/W56p the firmware should be V80 or above, if the W52p firmware is V73 or below, should change the setting via auto provision): Accept Features->General Information-> SIP Trust Server Only

Product Type
VP59 , SIP-T56A , SIP-T57W , SIP-T54W , SIP-T53W , SIP-T54S , SIP-T52S , SIP VP-T49G , SIP-T48G , SIP-T46G , SIP-T42G , SIP-T41P , SIP-T40G , SIP-T40P , SIP-T29G , SIP-T27G , SIP-T23G , SIP-T23P , SIP-T21(P) E2 , SIP-T19(P) E2 , VP530 , SIP-T38G , SIP-T32G , SIP-T28P , SIP-T26P , SIP-T22P , SIP-T21P , SIP-T20P , SIP-T19P , SIP-T27P , SIP-T42S , SIP-T58A
V73 or higher
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