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Introduction
Secure Voice Transmission
Prerequisite: To be able to use secure voice transmission, this feature
must be actiuvated by service personnel.
You can set up a secure connection withOpenStage 5 SIP phones if the re-
ceiving phone also has the capability. The voice transmission is encrypted;
it is decrypted in the receiving party's telephone. Even the signaling for call
setup and the exchange of encryption information occur over a secure con-
nection. The phones must have valid registration on an SIP server. You can
set whether a short tone can be heard if the connection is not secure (see
! page 49).
Telephone Types
The administrator can set up the OpenStage 5 SIP as:
•
•
10
a single-line telephone.
a multiline telephone
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