I am using nokia n9 running with PR 1.2.I configured voipdiscount.But one problem existing,nothing hearing from other side when calling(ie.silence in every call) .They can hear me very clearly,what i do.May be i configured wrongly,I need help to configure correctly .Do not forget I need to configure voipdiscount.

it automaticly discover setting, put it in auto-detect STUN on.
Discover public address on.
Transport automatic.
maybe change port 5060 to 3478.

Hi freind
I tried with the above settings still remaining same.Here is the settings I put

SIP address : 1234@sip.voipdiscount.com

Password : xxxxxx

User name : 1234

Transport : Automatic

Outbound proxy : (left blank)

Port : 5060 ( Also tried with 3478)

Discover public address : ON

Loose Routing :Off

Keep alive mechanism : Automatic

Keep alive period : Automatic

Auto detect STUN : ON

When calling I can hear the beeping sound.But after pick up nothing hearing.

I've got the same settings and have no problems. On their help page it says to use a stun server if you have audio problems. See the bottom of this page:
https://www.voipdiscount.com/sip