Version 7.2 1243 Mediant 1000B Gateway & E-SBC
User's Manual 65. Configuration Parameters Reference
Parameter Description
SBC Enable Subscribe Trying
configure voip > sbc settings > sbc-subs-try
[SBCSendTryingToSubscribe]
Enables the device to send SIP 100 Trying responses
upon receipt of SUBSCRIBE or NOTIFY messages.
[0] Disable (Default)
[1] Enable
BroadWorks Survivability Feature
configure voip > sbc settings > sbc-
broadworks-survivability
[SBCExtensionsProvisioningMode]
Enables SBC user registration for interoperability with
BroadSoft's BroadWorks server, to provide call
survivability in case of connectivity failure with the
BroadWorks server.
[0] Disable = (Default) Normal processing of
REGISTER messages.
[1] Enable = Registration method for BroadWorks
server. In a failure scenario with BroadWorks, the
device acts as a backup SIP proxy server,
maintaining call continuity between the enterprise
LAN users (subscribers) and between the
subscribers and the PSTN (if provided).
Note: For a detailed description of this feature, see
''Enabling Auto-Provisioning of Subscriber-Specific
Information of BroadWorks Server for Survivability''
page 759.
SBC Direct Media
configure voip > sip-interface > sbc-direct-
media
[SBCDirectMedia]
Enables the Direct Media feature (i.e., no Media
Anchoring) for all SBC calls, whereby SIP signaling is
handled by the device without handling the
RTP/SRTP (media) flow between the user agents
(UA). The RTP packets do not traverse the device.
Instead, the two SIP UAs establish a direct
RTP/SRTP flow between one another. Signaling
continues to traverse the device with minimal
intermediation and involvement to enable certain SBC
abilities such as routing
[0] Disable = (Default) All calls traverse the device
(i.e., no direct media).
[1] Enable = Direct media flow between endpoints
for all SBC calls.
Note:
The setting of direct media in the SIP Interfaces
table overrides this global parameter. In other
words, even if the parameter is disabled for direct
media (i.e., Media Anchoring is enabled), if direct
media is enabled for a SIP Interface (in the SIP
Interfaces table), calls between endpoints
belonging to the SIP Interface employ direct
media.
For more information on No Media Anchoring, see
''Direct Media'' on page 656.
Transcoding Mode
configure voip > sbc settings > transcoding-
mode
[TranscodingMode]
Global parameter that defines the voice transcoding
mode (media negotiation). You can also configure this
functionality per specific calls, using IP Profiles
(IpProfile_TranscodingMode). For a detailed
description of the parameter and for configuring this
functionality in the IP Profiles table, see Configuring
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