In an advisory to its wholesale customers, the telco advised that the number of exchange areas deemed too dangerous for Telstra staff to attend -- 'red zones' -- had diminished from 262 yesterday to 222 today.

The number of affected areas in which repair work could proceed in part -- 'amber zones' -- had diminished from 199 yesterday to 194 today.

"A combination of damaged infrastructure and loss of mains power has resulted in outages in many areas of the state," the customer advisory reads.

"Limited site access due to ongoing flooding means Telstra is unable to advise when service will be restored. We are working to restore services where possible."

Commenting on the state of services in Brisbane and Ipswich, the company said planned power cuts in the Brisbane CBD had not been experienced at this point in time and Edison, Charlotte and Woolloongabba exchanges remained on AC mains power.