AudioCodes Mediant 2600 - Page 301

Version 6.8 301 Mediant 2600 E-SBC
User's Manual 19. Coders and Profiles
Parameter Description
Web: Media IP Version
Preference
CLI: media-ip-version-
preference
[IpProfile_MediaIPVersionPrefer
ence]
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.
Web: Symmetric MKI
CLI: enable-symmetric-mki
[IpProfile_EnableSymmetricM
KI]
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/ufk04pR4
|2^31|1:1
a=crypto:3 AES_CM_128_HMAC_SHA1_80
inline:bnuYZnMxSfUiGitviWJZmzr7OF3AiRO0l5Vnh0kH
|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/QFuxw
|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).
Note: The corresponding global parameter is
EnableSymmetricMKI.