RULES ON ADVOCATE’S DUTY TO OPPONENTS
1. Not to negotiate directly with opposing party
An advocate shall not in any way communicate or negotiate or call for settlement upon the subject matter of controversy with any party represented by an advocate except through the advocate representing the parties.
2. Carry out legitimate promises made
An advocate shall do his best to carry out all legitimate promises made to the opposite party even though not reduced to writing or enforceable under the rules of the Court.
Thanks & Source http://www.barcouncilofindia.org/about/professional-standards/rules-on-professional-standards/