AudioCodes Mediant 800B User Manual page 299

User's Manual
Parameter
Web: Media Security Behavior
CLI: media-security-behaviour
[IpProfile_MediaSecurityBehaviour]
Version 6.8
manipulation. Thus, the called (i.e., SIP To header) and
redirect (i.e., SIP Diversion header) numbers are
different.
Note: The corresponding global parameter is
CopyDest2RedirectNumber.
Defines the handling of SRTP for this SIP entity.

[-1] Not Configured = Applies the settings of the
corresponding global parameter,
MediaSecurityBehaviour.

[0] Preferable = (Default) The device initiates encrypted
calls to this SIP entity. However, if negotiation of the
cipher suite fails, an unencrypted call is established. The
device accepts incoming calls received from the SIP
entity that don't include encryption information.

[1] Mandatory = The device initiates encrypted calls to
this SIP entity, but if negotiation of the cipher suite fails,
the call is terminated. The device rejects incoming calls
received from the SIP entity that don't include encryption
information.

[2] Disable = This SIP entity does not support encrypted
calls (i.e., SRTP).

[3] Preferable - Single Media = The device sends SDP
with a single media ('m=') line only (e.g., m=audio 6000
RTP/AVP 4 0 70 96) with RTP/AVP and crypto keys. The
SIP entity can respond with SRTP or RTP parameters:

If the SIP entity does not support SRTP, it uses RTP
and ignores the crypto lines.

If the device receives an SDP offer with a single
media (as shown above) from the SIP entity, it
responds with SRTP (RTP/SAVP) if the
EnableMediaSecurity parameter is set to 1. If SRTP
is not supported (i.e., EnableMediaSecurity is set to
0), it responds with RTP.
Notes:

This parameter is applicable only when the
EnableMediaSecurity parameter is set to 1.

If this parameter is set to Preferable [3] and two 'm=' lines
are received in the SDP offer, the device prefers the
SAVP (secure audio video profile), regardless of the
order in the SDP.

The corresponding global parameter is
MediaSecurityBehaviour.
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19. Coders and Profiles
Description
Mediant 800B Gateway and E-SBC