H3C Technologies H3C MSR 50 - Manual (Page 672)

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TLS-SRTP combinations
TLS protects control signaling, and SRTP encrypts and authenticates voice media flows. You can use them
separately or together. The following table shows four combinations of TLS and SRTP.
Table 241 TLS-SRTP combinations
TLS SRTP Description
On On
Signaling packets are secured. Personal information is protected.
Media packets are secured. Call conversations are protected.
Recommended.
Off On
Signaling packets are not secured. Personal information is not protected.
Media packets are secured. Call conversations are protected.
On Off
Signaling packets are secured. Personal information is protected.
Media packets are not secured. Call conversations are not protected.
Off Off
Signaling packets are not secured. Personal information is not protected.
Media packets are not secured. Call conversations are not protected.
Support for SIP extensions
• Strict SIP routing is supported. In a complicated network environment where a request from SIP UAC
to SIP UAS needs to pass through multiple proxy servers, SIP uses the Route header field and the
Record-Route header field to make sure that requests in the dialog can be routed through these
proxy servers.
• The new update method for SIP defined in RFC 3311 is supported. It is mainly used to update
parameters of a session, such as switching codecs, switching the voice to the media server, and
mute operation before the session is established, but has no impact on normal call procedures.