Medium Sized Company Scenario

Currently, we have an Avaya IP Office (406 at the main location and 403 at the backup location). We have 20 SoHos (growing very rapidly)and have severe QoS issues at the home locations. Avaya has stated that the issues can't be resolved. So, we are looking at other options. The Avaya CM3 has been offered as a replacment, but we are looking at other vendors as well. No one has stated that they can solve the IP phone quality issues. Avaya and Shoretel offer integration of a PSTN line in the homes into the corporate phone system. Mitel does not but states that they have no one with QoS issues using the public internet for calls. Does anyone out there have the same type of issue or could anyone provide feedback on the VoIP quality with these or other vendors?

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