Unable to make calls through third party SIP settings (or using Internet call settings)

I am unable to make calls through any third party SIP (Internet call settings) option. Usually I use third party SIP for international calls when I am in WIFI coverage area. Previously I was using Nexus 4(with T-Mobile) and it was working fine with that phone, but seems like it is not working here.

I have set the SIP settings under "Settings->Device->Calls->Internet Call settings->Accounts" and also have setup "Use Internet calling" option to "Ask for each call" so that phone dialer should ask a phone dial option (regular/SIP call) for each call.

May I know, Is this (internet/SIP calling) is supported on this FreedomPop device (HTC Evo 4G) or am I missing any settings here?


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