SIP Account Configuration
Once the account is registered correctly, the GSC3516/GSC3506 will show the account status under Status
Account Status.
SIP Account Status
By default, the GSC3516/GSC3506 Blocks non-whitelisted numbers under Calls → Blacklist/Whitelist/Greylist → Greylist,
user needs to either allow Non-White list calls or set up a Whitelist that contains the number that will be allowed to call the
GSC3516/GSC3516.
Greylist Calls
On the screenshot below, only number 1001 is allowed to call GSC3516/GSC3506: