When BBSes started using QWK and similar tech to allow message downloads (and response uploads), the constant busy signals became less of an issue. There also w

When BBSes started using QWK and similar tech to allow message downloads (and response uploads), the constant busy signals became less of an issue. There also was another traffic jam of busy signals at midnight for those BBSes with door games that started new turns at midnight. Some sneaky folks would take a turn right before midnight and then another right after midnight, getting two turns without anyone else getting on in between since they never relinquished the line between turns. Worked well for combat games like Global War (Risk).