There is no such thing as an "international version" of the iPhone. iPhones are country or region specific. Some countries, notably those in the Middle East, have restrictions on FaceTime. Some (China) have restrictions on FaceTime audio, but allow FaceTime video calls.
Countries like Japan and South Korea have restrictions on the ability to silence the sound of the camera shutter.
No matter where it's from, the warranty is only valid in the country where the device was originally sold. You may not be able to get it serviced at all outside of the country of original sale.
Models sold in different regions my not support the LTE bands used in your country.
The Middle East has been flooded with gray market phones from outside of the region largely in an attempt to circumvent the laws regarding FaceTime. There are also quite a few stolen devices to be found on the market there.
The bottom line is you should buy a phone directly from Apple or from an authorized retailer in the country where you live and intend to use the device.
Anyone selling an "international" version of the iPhone in the Middle East is most likely in violation of the laws of your country.