Session Initiation Protocol 
State Implementation Plan 
Software Installation Plan 
State Implementation Plans 
Supplementary Ideographic Plane 
Separation Instrument Package 
Single Inline Package 
Standard Interface Panel 
Session Initiated Protocol 
System Improvement Plan 
System Improvement Program 
System Integration Plan 
Satellite Interceptor Program 
School Improvement Program 
Simple Internet Protocol 
Single In-line Package 
state improvement plan 
Strain Isolator Pad 
Strategic Information Plan 
Submission Information Package 
System Implementation Plan 
Safety Injection Pump 
Schedules Input Program 
School Improvement Plan 
Scientific Instrument Package 
SDMS Interface Protocol 
Shuttle Interface Panel 
Silicon Intellectual Property 
Site Implementation Plan 
social information processing