I am planning to install 3cx (16 calls) on Win 7 64bit PC (core i7 8GB ram) with Time Warner Business Cable 15mbps x 2mbps. There will probably be around 5 to 10 simultaneous calls by the users with no outside extension, softphones or my3cx phones. There will be 12 VOIP Yealink T38G phones with Nexvortex VOIP provider. There are 12 Windows workstations with standard internet data usage (browsing, email, etc). The phones will connect to 100MB switch and pigtail to the workstations. The firewall is Dell Sonicwall TZ215W. Will this environment be ok for bandwidth and call quality?