CHAPTER31 Utilizing Gateway Channel Resources for SBC
Mediant 1000 Gateway & E-SBC | User's Manual
31 Utilizing Gateway Channel Resources for
SBC
The device can utilize resources of non-configured Gateway channels (analog and digital) for SBC
sessions, regardless of whether the device is licensed for SBC functionality. This feature, in
essence, allows "call" resources to be migrated from the Gateway application to the SBC
application, allowing you to migrate your Gateway deployment to an all IP-based voice network
with only a simple configuration change. One of the main advantages of the feature is that if you
purchased the device for deploying it initially as a Gateway for PSTN calls, you can at any stage
easily use the device for SBC calls without having to purchase an SBC license.
A Gateway channel is considered "not configured" if it is not associated with any Trunk Group (see
Configuring Trunk Groups). If all Gateway channels are configured, resources from these channels
cannot be used for SBC sessions. If the resources of a currently active SBC call is obtained from a
Gateway channel and you configure all Gateway channels during the call, the device maintains the
SBC call until it is terminated by the call parties, but obtaining resources from Gateway channels
for new SBC calls will not be made possible.
For every non-configured Gateway channel, one SBC session can be processed. For example:
A License Key licensing 1 E1 and 4 FXS and 1 BRI can support up to 37 SBC sessions (31
channels for E1 + 4 channels for FXS + 2 channels for 1 BRI port) if all the Gateway channels are
not configured. If the License Key also provides a license for 5 SBC sessions, up to 42 SBC
sessions (31 channels for E1 + 4 channels for FXS + 2 channels for 1 BRI port + 5 sessions for
SBC) can be supported.
The number of SBC sessions that can be derived from using resources from Gateway channels
that are not configured is displayed in the Web interface's License Key page (see Viewing the
License Key), in the 'TDM-to-SBC Sessions' field.
● To support the feature, the License Key installed on your device must include the
"TDM-to-SBC" feature key; otherwise, to purchase the feature, contact the sales
representative of your purchased device to upgrade your License Key.
● The maximum number of SBC sessions that can be supported is according to the
device's maximum SBC capacity (see Channel Capacity).
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