Pixe I do this for a living try to explain what types of troubles your having also tell me the type of pbx they have it sounds like it could be a issue with your circuit not the phone system VoIp can be a good solution if you by the right equip but more than likley you have a circuit issue esspecialy if you are having dropped calls and slow internet speed if your company has a full 24 channel T and yall are only using 8 channels off of it for voice I dont really see it being a pbx issue not unless your using alot of band width on the data side then you can run into issues there
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