Hello,
We have good understanding working with VOIP phones and have total experience 5 years. To be on realistic side we have downloaded the qutecom-2.1 source code and looking into the configuration steps. Since it has large source code base the configuration might take some more time, but once done we can complete your requirements quickly.
Do let us know if you are interested to work with us, we are confident and provide you for term commitment with quality deliverables.
Please do let us know your comments.
Thanks,