On 10/28/2013 9:41 PM, Chandran Manikandan wrote: > I want to make own ip pbx server for our office with need to call local > extension through soft dialer. > How to make this system without any pstn provider. reinventing the wheel. roll your own telephony will suck up an infinite supply of your time and energy, and likely end up with a system that noone but you can understand and manage. you'll still need a PSTN provider if you want to be able to make/receive outside calls from this system. and yeah, asterisk.org is the building block that enables all this wonderful stuff -- john r pierce 37N 122W somewhere on the middle of the left coast