I’m making an assumption that your Autohybrids ring okay when called from another internal station however will not ring when called from a DID (or other) trunk.
Check the trunk-group in question and see if there is an option for ‘Internal Alert?’. If so, translate it to reflect ‘y’es.
This will cause 1 long burst of ringing (~1 sec on/~4 sec off) to be sent to the analog line port vs 2 short bursts. When this is set to ‘n’o, older modems and fax machines typically don’t answer automatically either.
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