Figure 10 : Settings To Block Anonymous Call - Grandstream Networks GXP21 Series Security Manual

•
Additional SIP security settings:
under Web GUI
- Accept Incoming SIP from Proxy Only:
Set "Yes" to force the GXP to Check SIP address of the Request URI in the incoming SIP message; if it
doesn't match the SIP server address of the account, the call will be rejected.
Additionally, the GXP has built-in mechanism that detects and stops the spam SIP calls from ringing the
phones. Please see below the settings.
Validate Incoming SIP Messages:
-
Set "Yes" to Validate incoming messages by checking caller ID and CSeq headers. If the message does
not include the headers, it will be rejected.
Check SIP User ID for Incoming INVITE:
-
Set "Yes" to enable checking the SIP User ID in the Request URI of incoming INVITE; if it doesn't match
the GXP SIP User ID, the call will be rejected. Direct IP calling will also be disabled if checked.
Authenticate Incoming INVITE:
-
Set "Yes" to Challenge the incoming INVITE for authentication with "SIP/401 Unauthorized" message
→ →
Account X SIP Settings

Figure 10 : Settings to Block Anonymous Call

GXP Security Guide
→
Security Settings:
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