How does the alternate gatekeeper feature work on the ATA 186 and what RAS messages are supported for the alternate gatekeeper feature?
A. The ATA 186 allows a primary and a secondary gatekeeper (static alternate gatekeeper) to be configured. It can accept up to four dynamic alternate gatekeepers configured by the H.225 Registration, Admission, and Status Protocol (RAS) messages. It can handle both temporary and permanent alternate gatekeepers. When an alternate gatekeeper list is received with a H.225 RAS message, the secondary gatekeeper is merged and sorted with the dynamic alternate gatekeepers. The secondary gatekeeper is kept and placed with the lowest priority. In order to allow the ATA to switch back to the primary gatekeeper automatically, a timeout value in seconds is configured in the AltGkTimeOut parameter. Currently, the ATA supports the alternate gatekeeper list in the GCF/GRJ, ACF/ARJ, RCF/RRJ, and DRJ RAS messages.
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