Cisco ATA188-I2-A Administration Guide - Page 66
Setting Up Gatekeeper Time-To-Live Value, Setting Up an Alternate H.323 Gatekeeper, Related Parameters
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Important Basic H.323 Services Chapter 4 Basic and Additional H.323 Services If LoginID1 and LoginID2 are not used or are not set to identical values, the Cisco ATA uses dual-registration mode. Related Parameters • LoginID0, page 5-18 • LoginID1, page 5-19 • UID0, page 5-16 • UID1, page 5-17 Setting Up Gatekeeper Time-To-Live Value You can specify the valid duration of the H.323 gatekeeper registration, in seconds, by using the GkTimeToLive parameter. Related Configuration Parameter GkTimeToLive, page 5-14 Setting Up an Alternate H.323 Gatekeeper To provide redundancy in systems that use an H.323 gatekeeper, the Cisco ATA allows you to either statically configure an alternate H.323 gatekeeper or dynamically assign an H.323 gatekeeper. To enable the static alternate gatekeeper feature, you need to configure the AltGk parameter with the IP address assigned to the alternate H.323 gatekeeper. To enable the Cisco ATA to perform full gatekeeper registration when it switches to a statically configured alternate H.323 gatekeeper, configure Bit 3 of the ConnectMode parameter to the value of 1. To enable the dynamic alternate gatekeeper feature, you need to configure the primary H.323 gatekeeper so that the list of alternate gatekeepers is included in the H.225 RAS messages that the H.323 gatekeeper sends to the Cisco ATA. The Cisco ATA can accept as many as four dynamic alternate gatekeepers configured in the H.225 RAS messages. (The Cisco ATA supports the alternate gatekeeper list in GCF/GRJ, ACF/ARJ, RCF/RRJ, and DRJ RAS messages.) Dynamic alternate gatekeepers and static alternate gatekeepers can co-exist. When the Cisco ATA receives an alternate gatekeeper list in an H.225 RAS message, the static alternate gatekeeper is merged with the dynamic alternate gatekeepers. The static alternate gatekeeper is kept and given the lowest priority. You can configure the AltGkTimeout parameter to specify the number of seconds the Cisco ATA should wait before it automatically switches back to the primary H.323 gatekeeper after being moved to an alternate gatekeeper. By default, the switch-back procedure is disabled (the AltGkTimeout parameter value is set to 0). Related Configuration Parameters • AltGk, page 5-14 • AltGkTimeOut, page 5-15 • ConnectMode, page 5-32 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) 4-4 OL-4804-01