There is a FREE VOIP service specially for UAE or Qatar countries, web site is
SIP BroadBand Phone Service without Limits — SIPBB.COM
They call it "SIP BroadBand Phone Service without Limits - Free SIP Broadband Phone Service for UAE & Qatar etc. countries", check web site for more details, their service combines the VPN auto unblocking technology and the SIP softswitch All-on-one system, so it 100% works in UAE country, and it won't be affected even UAE internet authority blocks VOIP ports and filter out VOIP signal and RTP data packets.
Basically, it's free to use their service to make extension to extension calls, or call to 1800 toll free numbers to USA/Canada/UK etc. , or even accept phone calls from PSTN Access numbers, very convenient and does working very well. Seems they are adding more and more features to the service, check it by yourself if interested to use it.
Regards,