5.5. Connecting Multiple Hosts to SIUs

SIU systems may have multiple hosts connected to the same SIU or pair of SIUs. In this case, each host is responsible for the telephony circuits that it terminates. This must be specified in the config.txt file on the SIU(s). Each ISUP_CFG_CCTGRP command must specify in its <host_id> field which host is responsible for the circuit group. Additionally, the config.txt file must also specify, using the SIU_HOSTS command, the number of hosts that will be used.

On each host, the HostID parameter must be set to reflect which one is the local host. This allows Global Call SS7 to correctly identify the host when communicating with the SIU(s) and to know which circuit groups are configured on the local host.

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