I've had my PAP2 working fine to sipgate in the past on sipgate. Now\nfor an incoming call then handset rings and I can answer it. But audio\nis one way only (caller can hear me but I can't hear caller).\n\nI read somewhere that this is probably caused by being behind NAT\nrouter and some parameters need tweaking. On my NAT router I have\nseveral services set-up a long time ago and I don't know where I got\nthem from or what exactly they do. They are:\nSIP UDP 5060..5061 \nRTPLang UDP 5004 \nVoice UDP 8000..8012 \niax UDP 4569 \nSTUN UDP 3478 \npap2-rtp UDP 16384..16482 \n\nWhere are these parameters documented and which (if any) is likely to\nbe the cause of my one-way audio?