is 911 & 1911 different ?

Looks like they both are different and 1911 is something like if we are holding a firearm then call 1911. 1911 is highest priority call.

References:

http://www.thehighroad.org/archive/index.php/t-157319.html

http://www.marquette.edu/publicsafety/documents/EmergencyProcedureGuide.pdf