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UCM Security Manual
TRUNK SECURITY
A potential risk for trunks is that unwanted users may gain the authority to make international or long-
distance calls. This will result in unexpected high charges before the UCM administrator notices this. Usually
this high cost is due to improper configurations on the UCM. Therefore, administrators must be extremely
cautious when configuring those trunks that will be charged by placing certain calls, for example, PSTN
trunks or SIP trunks with international call capability.
Outbound Rule Permissions
Four methods are supported on UCM to control outbound rule permissions and users can apply one of
them to the outbound rule.
1.
Privilege Level
2.
Enable Filter on Source Caller ID
3.
Password protection
4.
PIN groups
Please make sure to configure it to allow only the desired group of users to call from this route.
Figure 9: Outbound Rule Permissions
Privilege Level
On the UCM, the supported 4 privilege levels are “Internal”, “Local”, “National” and “International” from the
lowest to the highest. Outbound calls through trunk can be placed only if the permission level assigned to
the caller is higher or equal to the privilege level of the outbound rule. Outbound call requests from users
with privilege lower than the outbound rule will be rejected.
