NEC UNIVERGE SL2100 Manual page 22

UNIVERGE SL2100 Release 1.8 Overview
Notes and Limitations:
This encryption acts only between SL2100 and a STD SIP terminal that supports this functionality.
Self-signed certificates and public CA certificates are supported although currently Intermediate
certificates if required are not usable on the SL2100.
NAT Traversal function is supported.
This feature does not support terminals where REGISTER isn't used (PRG15-24-04).
This feature does not support P2P. If P2P the call will be unencrypted.
This feature does not support encryption of video. It is audio only.
The TLS version of the encoding mode used is 1.2 or lower.
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