Hi,
I have the same problem of Port Block when trying to install and when trying to run the Network setup. I had installed Fring and used skype from my HTC Diamond PDA and it works fine and also I know that SIP Ports are not blocked by the GPRS Service of the GSM Service provider I am using because some other dialers using SIP Port 5060 is working fine with the GPRS.
I am using the the Pocket Talk software via the GPRS.
Please advice how to resolve the problem. Thanks