Sequential Ring Generator for TMS-6X and TMS-12A. The SQRG-12 Sequential Ring Generator is designed for applications where more than one person answers incoming calls and those persons may be in locations where the TMS-6X or TMS-12A is not visible. The SQRG-12 eliminates confusion about which line to answer next by displaying the oldest call as a ringing line on all phones in the phone system. Applications Generate automatic oldest call notification for the TMS-6X Generate automatic oldest call notification for the TMS-12A Eliminates call crashing on outbound calls when used with Viking s TMS-6X or TMS-12A Call Sequencers Features Compatible with ground or loop start lines Re-rings calls held by Viking s TMS-6X or TMS-12A Call Sequencers Selectable ring cadence 10 REN load total One year warranty Made in the USA.