Have you tried reaching out to mitel? I only ask because any of our clients with mitels, it's always a headache.
VoIP
Rules
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Be civil. Disagreements of varying intensities will happen, but particularly vitriolic attacks will be pruned from the discussion.
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Do not promote or advertise for any business, service or product unless responding to a specific request for recommendations. This includes recommending a user change providers when they have not indicated they are interested in doing so.
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Do not send private messages to users, or invite users to send you a private message, for the purpose of promoting or advertising a business, service or product.
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Do not invite, encourage, or seek help with engaging in unethical or fraudulent activity relating to VoIP, such as call spoofing, robocalling and autodialers, or fraudulent STIR/SHAKEN attestation.
I know a company that can help if you allow takeover of service vendor of record