The federal government is now battling a two-pronged war in defending the $43 billion National Broadband Network as the Australian Greens aired its demand to pore over on the project's business plan right before the parliament rises for the summer break.

Earlier, Communications Minister Stephen Conroy was put to task by suggestions of opposition communications spokesman Malcolm Turnbull that the NBN be subjected to a cost-benefit analysis by the Productivity Commission, which Senator Conroy has managed to evade so far.

Submitted by NBN Co, the business plan was forwarded to the communications ministry Monday last week and prior to its public release, major telecommunication firms such as Telstra Corporation and Optus already voiced out their opposition on a number of the plan's provisions.

Both telcos claimed that the NBN business plan would lead to the waste of huge amount of resources as it calls for the establishment of new communication networks on top of Australia's existing infrastructures.

That gripe has yet to include the possibility of millions of dollars of claim suits that the federal government would have to deal with as broadband service providers were set to be slowly ease out once the NBN project reaches the height of its roll out across Australia.

While Senator Conroy has already committed the release on the NBN business plan, following the document's sanitation and scrutiny by the Cabinet, Australian Greens Senator Scott Ludlam is pressing for its unveiling before the week ends.

Senator Ludlam reminded the government that Australians are natural shareholders of the NBN, which gives them the right to be aware of its dealings and in turn the Labor-led government has the responsibility to inform the public about the plan especially while the Parliament is still in session.

The Greens senator is strongly hoping that Senator Conroy would accede to the Senate's demand that they be briefed on the business plan's specific provisions and contents and the federal government's actual take on the NBN blueprint.

On the other front, Mr Turnbull is optimistic that his proposal for a cost-benefit analysis on the NBN project would get the nod of the parliament this week though he admitted that the Coalition has yet to muster the necessary numbers to ensure that his proposal would get through.

Mr Turnbull told ABC though that discussion with independent MPs are ongoing and many have committed to come up with the vote once the parliament takes up his proposal yet he did not specify if the MPs are set to support the Coalition's stand on the NBN issue.