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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 239 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.
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