Well hi all
Have spent sometime in dubai as a matter of fact the past 6 1/2 years. Could maybe contribute to the discussion
A) dubai is currently following an outdated labour law but which is now under revision and is available for all to see in the UAE ministry site
B) as far as bans go all cancelled visas immediately and automatically get a 6 months ban unless NOC is provided by employer.
C) Further incase 6 month ban is there then visit visa is usually taken for the candidate and then renewed after 3 month.Trips to Kish for junior management and to India or as applicable is usually done for the visa change
d) in the event that an employer files an absconding report at labour then this at least in dubai requires proper justification and proof.sometimes people are on vacation or company sends for projects out of UAE project bombs absconding report is filed!!! so then an absconding report is filed person id banned from entry into UAE please note this(all 7 emirates for life) before computerization people used to enter through other emirates.So no chance of a visit also
e)If one year ban is put then also at least in dubai the company has to be very powerful and have excellent contacts.If not the labour does no accept.Becaus in the event of 1 year ban also person cannot enter UAE on visit.It gos to immigration dept. also so no entry.
F) with reference to an article in Gulf news 4 months back approximately there is no comprehensive mention of bans in the labour laws.It seems that labour department themselves are confused about this.
G) Lastly labour laws are different from free zones.There there is no bans.You can change companies provided contract is fulfilled
H) In the event that probation is on then also companies that sponsor the visa have a right to ban the employee which is what many of the companies do.
I) Lastly to combat such practises Mission visa is now instituted in dubai labour.where a person is given visa for four months and his depending on the contract between company and individual even family can be brought to uae.This is good for it and short term projects or also for top positions in probation.
Now after having said all this i also have to inform you that there are companies which are owned by the government that are not even registered with the labour dept.YES this is true.they do not have any of there employee contracts registered with labour dept because they are government or as i call it semi public since govt companies now seem to have IPO's that are grand!! You would not believe this but these companies can do what they want.they deal directly with the immigration and an employee who has been wronged cannot go to labor because the labour says they are not registered with us and they do not come within our jurisdiction!!!
Lastly there is also premptive visa for govt. semi govt companies.In the event that they need you they will ask you if the current company is going to ban you when you leave.In the event that you say yes they will give something called a preemptive application!!! You wouldn't believe but with this application when the current company cancels visa and tries to put any ban they will be told that the moment visa is cancelled the person has been transfered to another visa
hence the preemptive application.but this is only possible for govt. semi govt.
At the very end as long as the company is not semi government or any such extremely powerful company there are sources through which even the 1 year ban can be removed
unfortunately i cannot state these sources but they are available in dubai.Basically the record of your ban will be erased and you can apply for a visa again
As for the 6 month ban the option is is visit visa or in case of big companies they give a letter to labour and get ban removed.
Well hope all that was useful.Will do my best to give more information where possible
Ur worng 
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