Figure 12: Settings to Block Unwanted Calls
- Only Accept SIP Requests from Known Servers:
When set to “Yes”, the GXV3370 will answer the SIP request from saved servers and only the SIP
requests from saved servers will be accepted. The SIP requests from the unregistered server will be
rejected. The default setting is “No”.
- Check SIP User ID for Incoming INVITE:
This configures the GXV3370 to check the SIP User ID in the Request URI of the SIP INVITE message
from the remote party. If it doesn't match the phone's SIP User ID, the call will be rejected. The default
setting is “No”.
- Authenticate Incoming INVITE:
This configures the GXV3370 to authenticate the SIP INVITE message from the remote party. If set to
"Yes", the phone will challenge the incoming INVITE for authentication with SIP 401 Unauthorized
response. The default setting is "No".
- SIP Realm Used for Challenge INVITE & NOTIFY:
Configure this item to validate incoming INVITE and NOTIFY. To use this feature, “Authenticate
Incoming INVITE” must be enabled first for it to take effect for INVITE. For NOTIFY, “SIP NOTIFY
Authentication” must be enabled first under web UI → Maintenance → Upgrade → Advanced Settings.
The SIP NOTIFY message information for the provision includes check- sync, resync and reboot.
SRTP
To protect voice communication from eavesdropping, the GXV3370 phones support SRTP for media traffic
using AES 128&256. It is recommended to use SRTP if server supports it. SRTP can be configured in web
UI → Account → Codec Settings.
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