Instruction manual

Security, privacy, and safety
555-233-767172 Issue 4 May 2003
Data restriction
Data restriction protects analog data calls from being disturbed by any of the
system’s overriding or ringing features. It is administered at the system level to
selected analog and multi-appearance telephones and trunk groups.
Facility restriction levels and
traveling class marks
Allows certain calls to specific users, while denying the same calls to other users.
For example, certain users may be allowed to use Central Office (CO) trunks to
other corporate locations while other users may be restricted to less expensive
private-network lines. You can administer up to eight levels of restriction for users
of AAR and ARS.
Malicious call trace
Allows you to trace malicious calls. You define a group of terminal users who can
notify others in the group when they receive a malicious call. These users can then
retrieve information related to the call. Using this information, you can identify
the malicious call source or provide information to personnel at an adjacent
system to complete the trace. It also allows you to record the malicious, call as
well as trace a malicious call over ETSI PRI.
Media encryption
Media encryption is the encryption of the voice or audio portion of a Voice Over
IP (VoIP) call. Media encryption can be used to provide enhanced privacy for
VoIP communications that involve exchange of sensitive information.
Typical non-encrypted VoIP calls are vulnerable to snooping by IP packet
monitors or sniffers. These devices connect to an IP network, watch for VoIP
packets, capture them, and play back the conversation either in real time, or store
the conversation on a hard drive for later playback.
IP packet monitors/sniffers are the electronic equivalents of wiretaps in the
circuit-switched world. By using media encryption to encrypt the VoIP packets
before they are sent onto the IP network, you reduce the risk of someone tapping
in to your VoIP call. An encrypted conversation captured by a packet sniffer
sounds like white noise or static to the eavesdropper.
Encrypted calls are transparent to the end user. That is, there is no visual or audio
indication that a call is being encrypted. Voice quality is not adversely affected by
media encryption. That is, encrypted calls sound just like non-encrypted calls to
the conversing parties.