Altigen ACM 6.5 Administration Manual page 354

When multiple systems are added to the VoIP domain, all member systems need to
have both Route Access Code and IP Trunk Access Code configured. If one or
more member systems are not configured properly, this message pops up:
Multisite routing may fail if Route Access Code and IP TrunkAccess Code are not
configured.
Upon successful login, Enterprise Manager opens, as in the following figure.
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MAXCS ACM 6.5 Administration Manual