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As I described above that doesn't work. With both ext-sip-ip and ext-rtp-ip I get one way audio. The reason could be that my provider/gateway uses a ALG

Hi, This is my setup: Phones -> PBX -> NAT -> Public Internet -> SIP Provider. My Firewall / Router is OpenBSD with UPNP. I am registered with my sip provider via TCP. Expire seconds is set to 600 and keeps this way the connection open. I made UPNP only to open ports for RTP which works fine...