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Description
Sometimes, the user will receive strange calls which are not from registered SIP server , these are so called ghost calls. It will disturb and confuse the user.
Resolution
1. Disable IP Call feature:
IP Call feature allow the SIP phone to make and receive calls by IP address (Without SIP account)
Enable or Disable IP Direct Call feature:
WEB UI path:
Features->General Information-> Allow IP Call
T32G/T38G can't support configure it through the web UI
Auto provisioning parameter:
# 0-disable; 1-enable; default value is 1 (Enable)
features.direct_ip_call_enable =
2. Enable SIP trust feature:
SIP Trust feature allow the phone to only accept the message from the trusted server for specific account.
Only by auto provisioning parameter:
# 0-disable; 1-enable; default value is 0 (Disable)
account.X.sip_trust_ctrl =
Only the version is V80 or higher support configure it through the web UI.