Allow Guest Calls; Figure 7: Ivr Dial Trunk - Grandstream Networks UCM6100 Manual Manual

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We recommend to disable "Dial Trunk" option unless the risk associated with it is clearly understood or the

PBX administrator intentionally configures it to do so for specific reasons. If it has to be enabled, please

configure the "permission" as secure as possible to restrict the authorized callers to be known users.

For more information about IVR permissions, please refer to IVR PERMISSION section in white paper:

How to manage inbound/outbound route on UCM6510/6100

ALLOW GUEST CALLS

"Allow Guest Calls" option can be found on web GUI->PBX->SIP Settings->General page.

We highly

recommend NOT to turn on this option for any deployments. Enabling "Allow Guest Calls" will stop the

PBX from authenticating incoming calls from unknown or anonymous callers. In that case, hackers get the

chance to send INVITE to UCM6100 and the UCM6100 will place the call without authentication. This can

result in high toll charges.

The administrator might also want to check CDR regularly to make sure there is

no suspicious calls in the early stage of deployment.

UCM6100 Security Manual

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