Avaya IP office

I am in need of someone to configure the advanced version of an Avaya IP Office system for my business. The specific features of the Avaya IP Office I am looking for a person those who can review and fix the Call Manager through SIP lines. There will be 1-10 users utilizing the Avaya IP Office system. I am seeking someone experienced in working with the Avaya IP Office who has a well-rounded knowledge of its features and capabilities. Please provide information regarding your experience and expertise with Avaya IP Office when contacting me. Thank you for your time.