Restricting or preventing SIP registration over WAN

To restrict or prevent the SIP registration at the Voice Call Manager over a WAN connection, navigate to Voice Call Manager > Users and click the button SIP users. The SIP users configuration dialog features a parameter that controls this. You can enable access via VPN, or prohibit it completely.

Additional security for the registration is provided by a count of the number of times that a SIP user authenticates incorrectly. Once the counter reaches a threshold value, the device locks the SIP user's account for a certain time. During this period the SIP user cannot log on to the Voice Call Manager. You set the threshold value and the locking time under Voice Call Manager > General in the section WAN login lock.

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