Hi,

the problem is to the access point(for example vodafone's access point)
that you are using to connect to the internet.
The same problem had also many others in many other countries.

I am from greece and i use vodafone gprs connection.
The vodafone here in greece has two access points "internet" and
"internet.vodafone.gr"
I had the problem using the first one but not when using the second one
access point.

I hope i helped you

RTSP uses TCP for player control messages,
and UDP for video and audio data.