It is a ZyXEL Phone connected to a ZyXEL Wlan Router. Sending INVITE INVITE => SER => ASTERISK ASTERISK send "Session Progress" everything is fine: ASTERISK sends "OK" Session starts. I can hear my Voice. After 6 Seconds Session breaks up. Something seems to be strange with the ACK the ZyXEL Phones sends: PHONE => PROXY ACK sip:0xxxxx@21.1.7.9 SIP/2.0 Via:SIP/2.0/UDP 21.28.17.18:5060;branch=z9hGddbkb8a7ca191bf4fd From:Zyxel<sip:1111111@domain.de;user=phone>;tag=C2E2D6CF845EA11AEBC2 To:<sip:0xxxxxxxxx@domain.de;user=phone>;tag=as4f89971f Call-ID:15482-E655-54C3-B488-1D32D8DF7653@21.28.17.18 CSeq:1 ACK User-Agent: ZyXEL P2000W VoIP Wi-Fi Phone Route:<sip:49xxxxx@21.1.7.8;ftag=C2E2D6CF845EA11AEBC2;lr=on>,<sip:492405690929@21.28.17.18:5060> When loggin with debug = 10 , i do not see some errors in syslog. The Gateway then sends 6 more "OK" and the terminate by sending "BYE". The Phone answers with "200 OK" .. ? Regards, Markus _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers