Over 7 Years, I have been working with a Team of Developers, range experiences of Mobile APP Development, SIP, VOIP Gateways, Softswitches. With the knowledge of Asterisk, Cent0s, Linux, MySQL, IPtables, Fail2ban. I have Installed, developed more than 300 Cisco Gateways for VOIP Network, along with SIP Platform. Yes, we are new to upwork, but we have alot of knowledge, with the understanding, that your project is important and needs the right person (s) to do it right. Give us a chance!