Hello, hope everything is good.

So recently inherited a customer which has a self-hosted Issabel PBX with about 15 users, really small company.

For the past few days outgoing calls have been dropped at exactly 21 seconds, calls connect and you can hear the person on the other side of the line but at exactly 21 seconds call is dropped.

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Fairly new to VOIP in general specially with this PBX, any tip greatly appreciated

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Thanks in advance!