[Users] Please help...... how to configure outgoing calls to pstn gateway

Hello Friends, I am having openser, some sip clients registered on it.how do I have to configure openser.cfg and/or pstn.cfg.Inorder to make call from sip clients to outside number. I can call from outside number to my sip clients. but other way around is not working. My mobile ---->-------->| PSTN GW |--------->------->|OPENSER|---------->--------->| SIP CLIENT| This is working fine My mobile <-------<-------| PSTN GW |<-------<-------|OPENSER|<--------<----------| SIP CLIENT| This case is not working I am not getting any log related to my outgoing call on openser , through ngrep. Please help, Regards Lokesh