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© SAMSUNG Electronics Co., Ltd.
page 55 of 162
VoIP Security
Signaling Encryption
The signaling encryption feature encrypts signaling information required for calls such
as the SIP protocol. TLS is used in signaling encryption for VoIP connections between
IPX-S300B and SIP phones and between IPX-S300B and endpoints.
Specifications of TLS serviced by IPX-S300B are as follows:
Uses OpenSSL library and supports TLS v1.2.
AES and ARIA are supported as media encryption algorithms.
Key management method is RSA and key length is 1024 bits.
Signaling encryption is not used for calls between phones or endpoints enabled with
encryption and phones or endpoints not enabled with encryption.
Media Encryption
The media encryption feature provides encryption for the voice data exchanged
between the caller and the callee for calls established with signaling encryption. Media
encryption can be enabled to calls between SIP phones or between a phone and an
endpoint by applying secure RTP (sRTP), in which case, IPX-S300B performs
signaling for sRTP.
IPX-S300B supports media encryption for calls with phones, IPX-S300B’s built-in
conference system, IPX-S300B’s built-in voice mail system, and endpoints, but not
with IPX-S300B’s built-in MOH system.
IPX-S300B supports AES and ARIA as media encryption algorithms.
ARIA is a block encryption algorithm developed in Korea in 2003 for protection of
information for public administration services. This is used as the TLS and sRTP
encryption algorithm.
Media encryption is not used for calls between phones or endpoints enabled with
encryption and phones or endpoints not enabled with encryption.
Feature Services
Class Of Service (COS)
IPX-S300B allows the administrator to set privileges for each user. Since setting
service privileges for all the users individually could be very complicated, Class of
Service can be created with their own set of service privileges and users can be
assigned to their appropriate Class of Service.
When a user group is created, a default service group is automatically created for the
user group. If you wish to apply a different Class of Service than the default Class of
Service, you can create a new Class of Service and use it.
Each Class of Service can be set with different service privileges. It also supports
override levels and privacy levels, whereby a particular service is provided only if the
overriding user’s override level is higher than the privacy level of the user being
serviced.
