AudioCodes Mediant 500L MSBR

User's Manual 24. Digital PSTN
Version 6.8 359 Mediant 500L MSBR
24 Digital PSTN
This section describes the configuration of the public switched telephone network (PSTN)
related parameters.
24.1 Configuring Trunk Settings
The Trunk Settings page allows you to configure the device's trunks. This includes
selecting the PSTN protocol and configuring related parameters.
This page also enables the following maintenance procedures:

Taking a Trunk Out of Service: Some parameters can be configured when the trunk
is in service, while others require you to take the trunk out of service. This is done by
clicking the Stop button. Once you have "stopped" a trunk, all current calls are
dropped and no new calls can be made on the trunk.

Deactivating a Trunk: You can deactivate a trunk for maintenance. This is done by
clicking the Deactivate button. Deactivation temporarily disconnects
(logically) the trunk from the PSTN network. Upon trunk deactivation, the device
generates an AIS alarm on the trunk to the far-end. As a result, an RAI alarm signal
may be received by the device. A subsequent trunk activation, done by clicking the
Activate button, reconnects the trunk to the PSTN network and clears
the AIS alarm. Trunk deactivation is typically used for maintenance such as checking
the trunk's physical integrity.

Creating a Loopback Line: You can create (and remove) remote loopback for DS1
lines. This is done by clicking the Create Loopback button. To
remove the loopback, click the Remove Loopback button.
Notes:
• To delete a configured trunk, set the 'Protocol Type' parameter to NONE.
• For a description of the trunk parameters, see ''PSTN Parameters'' on page 934.
• During trunk deactivation, you cannot configure trunks.
• You cannot activate or deactivate a stopped trunk.
• If the trunk can’t be stopped because it provides the device’s clock (assuming the
device is synchronized with the BRI clock), assign a different trunk to provide the
device’s clock or enable ‘TDM Bus PSTN Auto Clock’ in the TDM Bus Settings
page (see ''TDM and Timing'' on page 362).
• The displayed parameters depend on the protocol selected.
• If the protocol type is CAS, you can assign or modify a dial plan (in the 'Dial Plan'
field) and perform this without stopping the trunk.
• The ISDN BRI North American variants (NI-2, DMS-100, and 5ESS) are partially
supported by the device. Please contact your AudioCodes sales representative
before implementing this protocol.