AudioCodes Mediant 500 E-SBC User Manual page 304

Parameter
[IpProfile_VoiceVolume]
Web: Media IP Version Preference
CLI: media-ip-version-preference
[IpProfile_MediaIPVersionPreference]
Web: Symmetric MKI
CLI: enable-symmetric-mki
[IpProfile_EnableSymmetricMKI]
User's Manual
The valid range is -32 to 31 dB. The default is 0 dB.
Note: The corresponding global parameter is VoiceVolume.
Defines the preferred RTP media IP addressing version for
outgoing SIP calls. This is indicated in the "c=" field
(Connection Information) of the SDP.

[0] Only IPv4 = (Default) SDP offer includes only IPv4
media IP addresses.

[1] Only IPv6 = SDP offer includes only IPv6 media IP
addresses.

[2] Prefer IPv4 = SDP offer includes IPv4 and IPv6 media
IP addresses, but the first media is IPv4.

[3] Prefer IPv6 = SDP offer includes IPv4 and IPv6 media
IP addresses, but the first media is IPv6.
Notes:

This parameter is applicable only when the device offers
an SDP.

The IP addressing version is determined according to the
first SDP "m=" field.

The corresponding global parameter is
MediaIPVersionPreference.
Enables symmetric MKI negotiation.

[0] Disable = (Default) The device includes the MKI in its
SIP 200 OK response according to the
SRTPTxPacketMKISize parameter (if set to 0, it is not
included; if set to any other value, it is included with this
value).

[1] Enable = The answer crypto line contains (or
excludes) an MKI value according to the selected crypto
line in the offer. For example, assume that the device
receives an INVITE containing the following two crypto
lines in SDP:
a=crypto:2 AES_CM_128_HMAC_SHA1_80
inline:TAaxNnQt8/qLQMnDuG4vxYfWl6K7eBK/ufk0
4pR4|2^31|1:1
a=crypto:3 AES_CM_128_HMAC_SHA1_80
inline:bnuYZnMxSfUiGitviWJZmzr7OF3AiRO0l5Vn
h0kH|2^31
The first crypto line includes the MKI parameter "1:1". In
the 200 OK response, the device selects one of the
crypto lines (i.e., '2' or '3'). Typically, it selects the first line
that supports the crypto suite. However, for SRTP-to-
SRTP in SBC sessions, it can be determined by the
remote side on the outgoing leg. If the device selects
crypto line '2', it includes the MKI parameter in its answer
SDP, for example:
a=crypto:2 AES_CM_128_HMAC_SHA1_80
inline:R1VyA1xV/qwBjkEklu4kSJyl3wCtYeZLq1/Q
Fuxw|2^31|1:1
If the device selects a crypto line that does not contain
the MKI parameter, then the MKI parameter is not
included in the crypto line in the SDP answer (even if the
SRTPTxPacketMKISize parameter is set to any value
other than 0).
304
Mediant 500 E-SBC
Description
Document #: LTRT-10427