The problem with this is the 0.004 per minute charge. A US call cost from 0.007 and up (flat rates) this will only save up 0.001 to anyone who will use SIP. Th

The problem with this is the 0.004 per minute charge. A US call cost from 0.007 and up (flat rates) this will only save up 0.001 to anyone who will use SIP. Then there's this issue with Apps developed in Plivo cloud not being that much 100% compatible with the open source plivo framework.