Huawei ramps up challenge to Australia's 5G ban, declares national security is safe. Communications minister Paul Fletcher spokesman says gov't "stands by decision".

Huawei is stepping up its campaign against the Federal Government after the Chinese telco giant was banned from supplying Australia's 5G mobile rollout last year.

A report by the tech consulting firm Ovum - commissioned by Huawei - says former prime minister Malcolm Turnbull was wrong to ban Huawei on national security grounds.

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Huawei's global chief security officer Andy Purdy is the latest to executive visiting Australia trying to overturn the decision and he says the report backs other evidence that 5G networks can be split to protect sensitive information being passed on to Chinese intelligence.

Andy Purdy spoke in Sydney with the ABC's senior business correspondent Peter Ryan.

Huawei chief security officer Andy Purdy (picture supplied by Huawei)