I installed fring on Nokia 5700 to use it with a 3rd party SIP server account for making and receiving calls, all the steps went find and I was able to successfully register to the SIP server without any troubles.

The Calls were also connecting but they had one way audio and voice from fring was heard while voice to fring was mute.

Nokia 5700 has no wifi , I was using GPRS connection to make calls, I suppose at some point the RTP packets destined to mobile were being lost due to the network NATs in place by the Mobile Service Provider, something was not doing the NAT traversal properly but still I am glad that at least I got half the thing to work!

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