I am a solutions architect, self-starter and technology enthusiast with over 8 years experience in data center and IT system technologies including virtualization, VoIP, storage systems, ERP and IaaS cloud infrastructures. I am also a VMware Certified Professional in data center virtualization (VCP-DCV) and a VMware Certified Associate in Cloud (VCA-Cloud).
Regarding your request, I have worked with various asterisk based IPPBX systems including FreePBX, AsteriskNow, Trixbox and Elastix. I can install, setup and configure a new server in your office with either Elastix or FreePBX and also configure the extensions and trunks on it.
However, for the server to be able to support your remote offices, you will need to have a WAN setup.
Kindly review my resume for more details.
I look forward to working with you on this.
Thank you.