Mutual agreement is necessary and that too documented in proper form before notice period is changed from originally stipulated as per appointment order.
If you now resign and want 1 month notice period the company will create problems.
So best is discuss with the company and get mutually agreed notice period.
Company always has an upper hand-you need relieving documents whenyou exit,but company will create problems.The alternative you have is judicial remedy which is time consuming.So on some matters one needs to negotiate and compromise (in practical terms)
Has your company done the same change in notice period with other employees who have been deputed abroad?
Discreetly find out from other employees also.
28th February 2016 From India, Pune
#AnonymousThank you sir for the reply,
So far the matter hasnt been brought up again, a performance and pay review is happening soon, so maybe they are planning to bring it up then.i know for a fact that a colleague who traveled abroad around the same time as I, was given a pay review letter with 3 months notice period. so its not uniform for every one.before the situation comes where this is discussed again , i wanted to be sure of my rights as an employee.
2nd March 2016 From India, Bengaluru