For reference, see OSI FAQ : "How is 'open source' related to 'free software'? The Open Source Initiative is a marketing program for free software. It's a pitch for 'free software' on solid pragmatic grounds rather than ideological tub-thumping. The winning substance has not changed, the losing attitude and symbolism have." Outside this rather unkind FAQ item, the OSI and its supporters have generally avoided the term "Free Software".
Absolutely precise information Jawad. I am running a digital agency and most of my clients are based in United States or Canada and its not possible for me to stay in touch with them through traditional phone system as it's too costly. So i started using CallHippo. It is really an amazing tool which helped me get USA virtual phone number and now my clients can call me on that number and they just have to pay local call charges. However, after sometime i came across Salesmate CRM which is having a built in virtual phone system. So, i switched to Salesmate CRM from CallHippo by using number portability services and currently i am using a virtual phone system along with a USA virtual phone number and all other CRM features, which has helped my sales team immensely. I just have to use my CRM to get all the details of clients and manage all the communication channels from one platform itself. Thanks for sharing.

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