ATCVoIP “Pledges to Quality Communications”. We at ATCVoIP business phone service provider, strive to ensure technology products and services of the highest quality and value, for the benefit of businesses striving to succeed in their competitive marketplaces. As one of the industry leader in US. The KIRK 5020 handset is an elegant Polycom KIRK handset positioned towards administrative environments across various vertical markets as it meets the needs for a wireless device that mobile workers within these market have.