Hi Samuel,
Welcome. We're glad you stopped by.
If you happen to have a doc that show's how to set up with a Mitel 3300 or 5000 I'd love to either link to it or post it.
Ralph
To my knowledge we don't have anything specific for Mitel, though I will double check that since we are currently working on some certifications with them (for different products with our Mediatrix branch).
We do have a list in Media5-fone for preconfigured IP-PBXs and SIP AS (stuff like Panasonic, Unify, Mediatrix, Asterisk, etc), we could definitely add Mitel 3300 and 5000 to the list if would have some sort of interop document, if specific settings are needed, DTMF payload for example. If no specific settings are needed, we just add those devices to the list, and it would make it much easier for the end-user to setup his SIP account in Media5-fone (he would only see the mandatory fields).
Tell me what you think.