I already had a similar case with Qt and QNetworkAccessManager. To manage the subdomains dynamically, I used a QNetworkRequest with a URL configured on the fly, and it works well without any noticeable impact on performance. Adding a cache layer (e.g. QNetworkDiskCache) can also improve efficiency if the data does not change too often.

@diredko
you can take a look at the Scalability section of the documentation

The calculating scaling ratio section has an example that used to help me a lot when I first was confronted with this issue.

Thanks everyone for insight . I have some idea now from where i should start .

Hello i wish if i could help you. please i need to send voice over network using tcp socket and i believe you can help me if you give me your code (server and client side both )i will be very thankful.thank you soo much in advance.

I am part of a team specializing in Qt custom software from components to custom solutions.

Qt is what we love and specialize and we have completed more than 120 Qt based projects world wide.
C, C++, Python, JS is what we use with Qt everyday
.
Samples: http://milosolutions.com
Testimonials: http://milosolutions.com/testimonials/

Skype: zanetaww

WWW: http://milosolutions.com
Thanks,
Zaneta at MILO