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--></style></head><body lang=ZH-CN link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Dear Sir or Madam<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>For example, IP phone received INVITE on UDP port 5060, IP phone reply with Trying, Ringing and OK from other source udp port(for example, 50217, other than 5060), but UDP port in Via and Contact SIP header are always 5060.<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>force_rport() has been removed in the script.<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>It works well for the 1<sup>st</sup> transaction within the dialog.<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>From the 2<sup>nd</sup> SIP transaction in the same dialog, topology_hiding_match() change the destination port to the above source UDP port(50217), which is ignored by IP phone as it is listening on 5060.<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>For example, the ACK message was sent to the 50217 UDP port of IP phone after IP phone send out OK message.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>It result in IP phone keeps on sending OK message.<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>Is there anyway to revise the return UDP destination port to 5060 provided in Via or Contact SIP header from IP phone?<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><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Best wishes,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Jeffrey<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><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><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>