MT7-TL10 Chinese Version can be upgraded by Global Version Rom? topic

I have a Chinese Version Mate 7 with version MT7-TL10 V100R001CHNC00B123SP03,

So Can I upgrade this mobile with the Global Version V100R001C00B119SP03 available on Huawei Web Site?

What are the languages supported in the Global Version?

[Q] MT7-TL10 B121 build-in SIP - No Sound topic

Have anyone tried to use build-in SIP client aka Internet calling? In my case it works, but without any sound. It doesn't matter if it's over WiFi or mobile network, so it's not network configuration. And yes, I've tried both UDP and TCP options. Even more, build-in SIP on Samsung on the same network, with the same SIP provider and with the same Android 4.4.2 works perfectly. Third-party clients are working also, but it's not convenient.

Any thoughts?