Here are the most commonly used "codes/signals" LPD and LPSO uses:
1: emergency! officer needs assistance
2: extra patrol or attention to a particular area
3: assist another agency (can be fire, law enforcement or EMS)
4: standby and assure the peace
5: service call, assist the public; non criminal in nature
6: service call for the PD
7: coffee break
8: lunch break
9: stolen vehicle recovery
10: request to locate a vehicle that has been misplaced, loaned out or traded for drugs
12: court attendance
11: hazard (either in roadway or wire down or chemical spill)
13: loose or vicious animal
15: littering
16: found or lost property
17: escort
20: traffic stop or vehicle in ditch with no injury or damage
21: traffic crash: Major=injury; Minor=no injury; Foxtrot=fatality
22: abandoned vehicle
23: parking complaint
24: traffic control. 24L=traffic light out or malfunction; 24V=stalled vehicle
25: mental patient
26: arrest warrant
27: denotes attempt; example 27-33=attempted suicide.
29: death by natural causes
30: homicide
33: suicide
34: aggravated battery. 34S=by shooting; 34C=by cutting/stabbing
35: simple battery
36: injury, non criminal. dog bite.
37: aggravated assault
38: simple assault
41: stakeout
42: aggravated rape
43: simple rape
44: aggravated kidnapping
45: simple kidnapping
46: false imprisonment
48: missing person
49: harrassing/threatening phone calls
50: mischief or nuisance (fireworks, etc)
51: aggravated arson
51B: bomb scare
52F: fire.
52E: explosion
52I: illegal burning
55: aggravated criminal damage to property
56: simple criminal damage to property
59: refusing to leave premises; loitering
60: aggravated burglary
61: city ordinance violation
62A: burglary alarm
62B: burglary of a business
62C: car burglary
62O: open/unlocked door or window
63: prowler
64A: armed robbery alarm
64G: armed robbery with a gun
64K: armed robbery with a knife
65: simple robbery
65P: purse snatching
67: Theft
67S: shoplifter
67A: theft from auto (rims, tires, hubcaps, etc)
67C: theft using stolen credit card
67B: theft of a bicycle
68: stolen vehicle
69: possession of stolen property
72: forgery
79: juvenile runaway
81: indecent behavior with a juvenile
82: prostitution
83: soliciting for prostitution
89: crimes against nature
90: gambling
91: unlawful sales of alcohol, tobacco, etc. to minors
92: contributing to the delinquency of a juvenile
93: child neglect/cruelty
94: illegal discharge of a firearm
95G: illegal carrying of a concealed gun
95K: illegal carrying of a concealed knife
98: OWI/DWI
99: reckless operation of a motor vehicle
100: hit and run
102: cruelty to animals
103D: domestic disturbance
103I: public drunkeness
103F: fight
103N: noise complaint (loud music, dogs barking, etc)
103(D,F)IP: in progress
103(D,FIP)W: with weapons
106: obscenity (flasher)
107C: suspicious circumstances
107P: suspicious person
107V: suspicious vehicle
108: resisting arrest/officer (emergency)
110: simple escape
962: drug dealing/buying/possession
Hope this makes your listening a little better.