Call outs are when you spot the enemy, the direction or location they are in and the number.
Added info can be how hurt they are, did you tag/spot them (are they lit)
It is very important to know the names of key areas on maps, easy on Bazaar as you have a map with names locations, learn them. You will want to shorten names as it is easier to call out "Curved" than "Curved Corridor".
An expample of good intel would be:
"Two on curved coming to B, one hurt, one lit." = Two enemy on cruved corridor, heading from C Flag to B Flag one was damaged and one was tagged/spotted.
A great response to this would be
" Two down on curved"
If you keep the call outs short and sweet and do not shout too much your team will be able to react, it also gives increased situational awareness. There is a psychology behind this, if you shout and get upset you will raise the stress levels of the team, that mean hearts will beat faster and adrenaline will be released, converting into shakey hands and bad/speedy judgements.
The calmer you stay the easier the game will be, you need to not shout or complain to teamies when you are in the game, focus is all important and if you can control your adrenaline to a slow steady release you will be able to focus better and deal with the changing situation. Too much adrenal release means you will peak too fast and then crash quickly, ability to concerntrate will drop and fatigue will make you emotional.
Its very important to call out when you die, sometimes your death if called out properly can lead to more of the enemy getting killed.
Things like:
"Im dead in hubbly, two on my body, do not res" = Just died in hubbly two enemy on my body or near, do not attempt to revive.
Also do not presume your teamies know to revive you, if you know its safe for a res ask for one.
As soon as you stop talking you start loosing, never forget to encourage your teamies when they get multikills ect.
I know it sounds obvious but if you can get the info across correctly it will give you the winning edge, try not talk too much about how the lame F2000 is owning you or how much the grenade spam is pissing you off.
A good player will be able to know how many enemy are alive at any time with the help of call outs and the kill feed. Looks out for squad wipes as this is the perfect time to move up, so many opportunities are wasted by teams that miss a squad wipe and hold back.