(Bloomberg) -- Britain is set to toughen the rules under which Huawei Technologies Co. operates in the country while stopping short of an outright ban on the Chinese telecom equipment maker, according to people familiar with the matter.

The measures, designed to address concerns that Chinese intelligence could use Huawei’s systems to spy on other countries, are expected to involve closer state oversight and may restrict the vendor from some sensitive parts of the U.K.’s telecom networks, said the people, who asked not to be identified as the discussions are confidential.

The results of a six-month review of Britain’s telecom supply chain were submitted Tuesday to the National Security Council chaired by Prime Minister Theresa May. Officials will spend coming days working through the details before announcing a final decision. The government declined to comment Wednesday on a Telegraph report that May had already decided to let Huawei build parts of the new networks.

Western allies are watching closely. Britain has monitored Shenzhen-based Huawei’s systems for several years, allowing it to emerge as a major supplier of U.K. communications infrastructure. Huawei denies that its equipment is vulnerable to state espionage.

The issue has divided U.K. government departments, with some officials pushing for tough restrictions and others concerned this would saddle the industry with extra costs and delay infrastructure upgrades, the people said.

Here’s what the government may do:

Exclude Huawei From Core Networks

The core is the brain of a network, housing control functions and private customer information. The government has been weighing whether to force all operators to adhere to security guidelines that already apply to the U.K.’s dominant phone company, BT Group Plc, which is set to remove Huawei from the core of the EE mobile network it bought in 2016. This could exclude vendors deemed as risky from law-enforcement functions such as wiretaps or installing equipment in Westminster, the home of central government.

Ensure a Mix of Suppliers

Officials are considering rules to ensure equipment in a given area comes from different vendors so that operators are not reliant on a single supplier’s technology, according to people familiar with the review.

Limit Outsourcing

Operators could be restricted from allowing vendors to manage their networks, according to one person familiar with the deliberations. Huawei has signed such “managed services” contracts with Telefonica SA’s O2 and CK Hutchison’s Three U.K.

More Testing and Regulation

The review may lead to new powers for communications regulator Ofcom, which is responsible for auditing and enforcing telecom security according to recent guidance from government. Ofcom is due to launch a cybersecurity attack testing system, it said in its annual plan last month.

Network Restrictions

Forbidding Huawei to supply equipment such as masts and antennas for upgraded mobile networks would be more drastic and is seen as unlikely. Technical experts say the radio access network is a low-risk part of the system. It also accounts for the majority of Huawei’s presence and sales in the U.K. Phone companies say such a ban would cost them hundreds of millions of pounds and delay the rollout of fifth-generation networks by years.

To contact the reporters on this story: Thomas Seal in London at tseal@bloomberg.net;Kitty Donaldson in London at kdonaldson1@bloomberg.net;Robert Hutton in London at rhutton1@bloomberg.net

To contact the editors responsible for this story: Kenneth Wong at kwong11@bloomberg.net, Thomas Pfeiffer, Giles Turner

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