Until now, operations at the joint complex have been normal despite the rise in tensions.
The complex is a joint industrial park and there are more than 120 South Korean companies that operate there, employing 53, 000 North Korean workers.
Operations at the joint industrial complex have been suspended since the North withdrew its workers in April.
The hotline is used to facilitate the travel of South Korean workers to a joint industrial complex in Kaesong.
The missile launches also came during a low in inter-Korean relations as Pyongyang has rejected repeated calls from Seoul for dialogue over their closed joint industrial complex.
The missile launches come during a low in relations between North Korea and South Korea as Pyongyang has rejected calls from Seoul for talks over their closed joint industrial complex.
Many of the stranded South Koreans work at the complex, which is a joint project between the Koreas.
Seoul has said the purpose of the complex was to develop a joint industrial park where South Korean companies could manufacture their products using North Korean labour.
The future of the Kaesong Industrial Complex in North Korea, a joint venture between southern capital and northern labour, is in doubt following a series of capricious demands by Pyongyang.
John Longden, Greenalls property director, said it had been a complex process to reach agreement on the joint venture.
The military needs such systems, particularly when soldiers are involved in international coalitions, joint humanitarian and peacekeeping missions that require complex resource sharing requirements.
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The East and North Hertfordshire Clinical Commissioning Group (CCG) said it had dropped referrals of joint replacements, which were the "most complex surgical treatments" handled at the centre.
Their jobs are at the only remaining operational symbol of joint inter-Korean cooperation, the Kaesong industrial complex.
In August the joint venture broke ground on a 74-unit apartment complex in the leafy Havana suburb of Miramar.
The Pinewood Atlanta complex will be built on 288 acres of land south of Atlanta, Georgia, as a joint venture with a US investment company.
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