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</o:shapelayout></xml><![endif]--></head><body lang=RU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Hello!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I have a such problem.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Opensips using 2 ports <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>One – 5068 for client which must register on Opensips<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Second – 5060 for all other clients.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Client </span>А <span lang=EN-US>registering on Opensips (socket: udp:2.2.2.2:5068). Client A is behind NAT.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Client </span>А <span lang=EN-US>receives incoming call (via lookup() function).<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>3)<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Call has such way<o:p></o:p></span></p><p class=MsoListParagraph><span lang=EN-US>Cisco (source port 11111 sends INVITE to port 5060 of Opensips) – Opensips (receives INVITE from Cisco to port 5060 and sends the INVITE to client from source port 5068 to some client`s port) – Client A. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Everything work fine until client </span>А <span lang=EN-US>answers. Then Client A sends to Opensips (port 5068) 200 OK, Opensips retransmit it to Cisco (from port 5060 to 11111), Cisco sends to Opensips ACK (from port 11111 to 5060) AND Opensips retransmit this ACK to client`s port FROM PORT 5060, BUT NOT 5068. This ACK didn`t reach client A because of NAT.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you for any help.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>