NEC UNIVERGE SL2100 Manual page 18

UNIVERGE SL2100 Release 1.8 Overview
sRTP Support
When TLS is not enabled, encryption of voice packets does not work, even if you set sRTP Mode "1:
enable".
PRG15-05-51(Read Only)
Transport Protocol
TLS
UDP/ TCP
 Copyright 2019 NEC Enterprise Solutions
18 of 34
PRG84-27-03
sRTP Mode
1: enable
0: disable
1: enable
0: disable
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Comments
The SIP messages and the voice packets
are encrypted.
The SIP messages are encrypted,
But the voice packets aren't encrypted.
SL2100 acts with PRG15-05-51.
(The voice packets aren't encrypted.)