AudioCodes Mediant 3000

User's Manual 416 Document #: LTRT-89730
Mediant 3000
Parameter Description

For more information on the Allowed Coders feature, see
Restricting Coders on page 561.
Allowed Video Coders
[IPProfile_SBCAllowedVideoCo
dersGroupID]
Assigns an Allowed Video Coders Group. This defines permitted
video coders when forwarding video streams to the SIP entity
associated with the IP Profile. The video coders are listed in the
"video" media type in the SDP (i.e., 'm=video' line). For this SIP
entity, the device uses only video coders that appear in both the
SDP offer and the Allowed Video Coders Group ID.
By default, no Allowed Video Coders Group is assigned (i.e., all
video coders are allowed).
To configure Allowed Video Coders Groups, see Configuring
Allowed Video Coder Groups on page 592.
Allowed Media Types
[IpProfile_SBCAllowedMediaTy
pes]
Defines media types permitted for the SIP entity associated with
the IP Profile. The media type appears in the SDP 'm=' line (e.g.,
'm=audio'). The device permits only media types that appear in
both the SDP offer and this configured list. If no common media
types exist between the SDP offer and this list, the device drops
the call.
The valid value is a string of up to 64 characters. To configure
multiple media types, separate the strings with a comma, e.g.,
"media, audio" (without quotes). By default, no media types are
configured (i.e., all media types are permitted).
SBC Media Security Mode
[IpProfile_SBCMediaSecurityBe
haviour]
Defines the handling of RTP and SRTP for the SIP entity
associated with the IP Profile.
 [0] As is = (Default) No special handling for RTP\SRTP is done.
 [1] SRTP = SBC legs negotiate only SRTP media lines, and
RTP media lines are removed from the incoming SDP offer-
answer.
 [2] RTP = SBC legs negotiate only RTP media lines, and SRTP
media lines are removed from the incoming offer-answer.
 [3] Both = Each offer-answer is extended (if not already) to two
media lines - one RTP and the other SRTP.
If two SBC legs (after offer-answer negotiation) use different
security types (i.e., one RTP and the other SRTP), the device
performs RTP-SRTP transcoding. To transcode between RTP and
SRTP, the following prerequisites must be met:
 At least one supported SDP "crypto" attribute and parameters.
 EnableMediaSecurity must be set to 1.
If one of the above transcoding prerequisites is not met, then:
 any value other than “As is” is discarded.
 if the incoming offer is SRTP, force transcoding, coder
transcoding, and DTMF extensions are not applied.
Enforce MKI Size
[IpProfile_SBCEnforceMKISize]
Enables negotiation of the Master Key Identifier (MKI) length for
SRTP-to-SRTP flows between SIP networks (i.e., IP Groups). This
includes the capability of modifying the MKI length on the inbound
or outbound SBC call leg for the SIP entity associated with the IP
Profile.
 [0] Don't enforce = (Default) Device forwards the MKI size as is.
 [1] Enforce = Device changes the MKI length according to the
settings of the IP Profile parameter, MKISize.