Yes, it can. BAS-IP equipment can be configured so ringtone goes to both intercoms simultaneously. In the intercom settings in Address tab, in Main field you should select “0” for the one intercom and “1” – for the other. The rest points of tab address (house number, entrance number, floor number, apartment number) should match.
And also both intercoms Sync field should have the same default value “123456” or any same number (this password between intercoms is required to avoid an unauthorized connection of foreign monitors). After work is done, you can receive a call on 2 internal monitors at once.