Twenty four telcos have received formal warnings for failing to meet all of their obligations under the Telecommunications Consumer Protections Code.
The Australian Communications and Media Authority said it had issued the warnings for failing to lodge documents with Communications Compliance (CommCom), the body established to oversee the TCP Code framework.
The number of CommCom warnings issued by ACMA has dropped from 39 in 2014 and 95 in 2013, the ACMA's chairperson, Chris Chapman, said.
"Each year the number of telcos doing the right thing is rising, so the message is getting through," Chapman said in a statement.
"However, the ACMA will continue to work with industry to improve TCP Code compliance and we'll remain vigilant about targeting those companies that persist in not complying."
The TCP Code was registered in September 2012 and CommCom was established to oversee its compliance framework.
Since the code's registration, the ACMA has issued 177 formal warnings, 28 directions to comply and one infringement notice.