Under the stricter regulatory framework, stock brokers have to compulsorily "use telephone recording system to record the instructions and maintain telephone recordings," in case the client is giving the orders on phone.
Issuing a circular to the stock exchanges, Sebi said that in spite of measures taken, a considerable proportion of investor complaints is of the nature of 'unauthorised trades'.
"... it has now been decided that all brokers shall execute trades of clients only after keeping evidence of the client placing such order," the circular said.
"When dispute arises, the burden of proof will be on the broker to produce the above records for the disputed trade," it added.
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The circular would be effective from January 1, 2018.
The regulator said the decision has been taken to further strengthen regulatory provisions against unauthorised trades as also to harmonise the requirements across markets.
Currently, the regulations for commodity derivative markets require members to execute the trade of clients only after keeping evidence of placing the order and the proof could also be in the form of sound recording.
"Sebi in the past has taken several steps to tackle the menace of 'unauthorised trades' viz periodic running account settlement, post transactions SMS/ email by exchanges/ depositories, ticker on broker/ DP websites...," the circular said.