[Required: MFS, EOS, SMEO, PBX1] To prevent conflicts between 911 (emergency service) and 91-11-(KXX)-KXX-XXXX (Flash data call), the switch shall be programmed in such a manner that after 911 is dialed and no other digits are received within 4 seconds (or after a # is dialed), the call will be treated as an emergency service call (911) and immediately processed. If additional digits are received within the 4-second time period, the call will be treated as a non-emergency call and handled appropriately.