Ribbon recommends using the Transparency Profile to configure transparency on the SBC Core for new deployments, as well as applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.
Refer to the SBC SIP Transparency Implementation Guide for additional information.
Use the Media window to define the parameters associated with media features for a specified SIP trunk group.
The SBC 7000 system supports creating IP Interface Groups containing sets of IP interfaces that are not "processor friendly" (i.e. carried on physical Ethernet ports served by separate processors). However, restrictions exist regarding the usage of such Interface Groups.
(This ability does not apply to the SBC 5400, which has only two physical media ports. You may configure the IP interfaces from the two physical ports within the same IP Interface Groups without restrictions.)
For complete details, refer to Configuring IP Interface Groups and Interfaces.
To View and Edit Media Parameters
The SBC does not support Lync/Skype.
On the SBC main screen, go to Configuration > System Provisioning > Category: SIP Carrier Peering > SIP Trunk Group > Media or
Configuration > Category: Trunk Provisioning > Trunk Group > SIP Trunk Group > Media or
All > Address Context > Zone > SIP Trunk Group > Media
The Media window opens. Use the drop-down lists to select the desired Address Context, Zone and SIP Trunk Group. The Edit Media options are displayed.
Figure 1: SIP Trunk Group - Media Edit Window
The following fields are displayed:
Parameter | Description |
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Advertise Audio Only | When enabled, SBC sends only the main audio/image stream in the SDP offer.
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App Specific Bandwidth | When enabled on a trunk group, this flag includes the b=AS attribute in the SDP outgoing offer or answer sent on that trunk group.
This flag does not insert the b=AS SDP attribute for non-audio streams or at the session level. The b=AS SDP attribute does not apply to the H.323 signaling interface. |
Comedia Connection Role | Indicates whether the SDP offer sent by the SBC includes a direction attribute line as defined by the Comedia draft.
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Data Path Mode Passthru | Determines whether the SBC will transmit media direction (Data Path Mode) received from a peer in the Offer SDP RTP IP.
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Direct Media Allowed | If enabled, attempt to set up a direct-media path so that media flows directly between endpoints in the same direct-media group.
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Direct Media Allowed Behind Napt | If enabled, attempt to set up a direct-media call for endpoints behind NAT.
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Direct Media Anti Trombone | Enable flag on trunk groups facing AS to allow direct media using C-line trigger (e.g. media anti-trombone).
Note: Direct Media configuration ( |
Direct Media Group ID | This identifies the direct media group to which this trunk group belongs.(default = 0). |
Disallow SRTP Stream | Determines whether the SBC forwards SRTP streams on egress when they are received in the incoming SDP, or if it sets the port to zero, thus disabling the SRTP stream. The options are:
Note: Users no longer have to enable the multipleAudioStreamSupport flag to configure the disallowSrtpStream flag. You can enable the disallowSrtpStream flag independently. However, the disallowSrtpStream flag will have an impact on the call flows only when any one of the two flags below are enabled:
When enabled, the disallowSrtpStream flag takes the first precedence. |
DTLS Profile Name | The name of the Dtls Profile to attach to this Trunk Group. To create a Dtls Profile, refer to Security - DTLS Profile. |
Late Media Support | Determines whether a SIP late media (reverse offer) INVITE should be converted to a forward offer on egress or else allowed to transparently pass through. Set this flag at the Ingress leg of the Trunk Group.
NOTE:
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Multiple Audio Streams Support | Determines whether the SBC processes multiple audio m-lines, or a combination of audio and image m-lines, in SDP.
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Max Ptime Default | This field indicates the default packet size in milliseconds. The value ranges from 10 to 150 and the default value is 150. |
Media IP Interface Group Name | Name of the IP interface group for media. |
Media IP Secondary Interface Group Name | Specifies the name of the secondary (or private address) IP interface group to use for media for calls involving the Microsoft Phone System. The name can be up to 23 characters long. |
Media IP Address | Each trunk group can have a media IP address configured to specify a specific IP address to use when allocating UDP or TCP media. The default value is 0.0.0.0. Note: Does not apply to D-SBC. If you prefer to choose an IP address from a range of values configured in Media Port Range (UDP) or TCP Port Range, set this parameter to the default value. Configure the Media IP Address as either an IPv4 or IPv6 address (except for H.323, which does not support IPv6 addresses). The configured IP address must belong to the IP Interface Group configured as the Media IP Interface Group for the trunk group. For additional details, refer to SIP over UDP and SIP over TCP. |
Media Addr Type | The media address type attribute determines the type of IP address the SBC uses in an offer.
Note: The Anat parameter page is only available when the IPv4 and IPv6 option is chosen. The Ice parameter page is available only when the IPv4 and IPv6 option is chosen and the Services NAT Traversal option enables Ice Support. Refer to Services - Nat Traversal. |
Msrp | Enables the MSRP payload relay over TCP connections that will be setup on a successful negotiation of MSRP SDP attributes.
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msrpB2BUA | This parameter ensures the role of SBC as B2BUA irrespective of the End Point role. Enable this parameter in both trunk groups to handle the msrp-cema attribute received in request/response messages.
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Msrp Mux | Enable this option to reuse an existing TCP connection with an IP peer for multiple MSRP sessions (MSRP multiplexing). MSRP multiplexing applies only to MSRP sessions established using back-to-back user agent (B2BUA) behavior. Multiplexing cannot be applied to MSRP sessions established based on the RFC 6714 “Connection Establishment for Media Anchoring” (CEMA) type of handling. The options are:
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Omr Allowed | Use this parameter to specify when to apply OMR procedures. (see Configuring SBC to Apply OMR Rules for additional details)
Note: The PSX flag NOTE: This configuration is not supported on ERE and is intended for use only with an external PSX. |
Omr Primary Realm | Use this parameter to choose an Address Context realm name to use as the primary realm for this SIP trunk group. Note: This configuration is not supported on ERE and is intended for use only with an external PSX. |
Recordable | Enable this flag to support the media recording of RTP stream to an external recording device on this SIP trunk group.
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Relay Unknown Attrs For Audio Trancode Calls | Specifies whether or not to relay of unknown SDP attributes in the core audio stream for transcoded calls. Options are:
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SDP Attributes Selective Relay | Enable this flag to control the selective relay of unknown SDP attributes at the session level and attributes from the core audio stream.
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Source Address Filtering | When enabled, incoming media packets that do not match the expected source IP address and UDP/TCP port are filtered out.
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Tmr64K | Enable this flag to allow the transmission Medium Requirement Unrestricted 64kbit/s control for SIP-ISUP interworking.
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Make the required changes and click Save at the right hand bottom of the panel to save the changes made.
Additional topics in this section: