"[But] this is something that is capable of resolution, it should not, need not, hold things up," he told ABC Radio yesterday. "On the other hand, the undertaking we are seeking is an important one, it's not a walk in the park."
Mr Sims said that if the ACCC did not accept Telstra's plan, the telco might have to go back to the drawing board.
"If the structural separation undertaking is not accepted then Telstra needs to step back and revisit their alternatives," he said. "The key focus should be getting what's in front of us right rather than contemplating new directions."
The ACCC released a discussion paper on Tuesday asking for comments from industry stakeholders and consumers on Telstra's structural separation undertaking and draft migration plan.
Mr Sims said the commission's main concern was how Telstra would maintain equivalent services for customers.
The commission's initial view was there needed to be a clear and enforceable commitment to an "equivalence of outcomes" that enabled wholesale customers and Telstra's retail businesses to gain access to key input services of equivalent quality and functionality.
The commission also had major worries about arrangements between Telstra and NBN, especially the ability of the two to change conditions of their agreements without more scrutiny by the competition overseer.
The telco has said it would work with the ACCC to obtain acceptance before Telstra's annual general meeting on October 18.
- AAP