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Status: 183 Session Progress but no ringing/alerting

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  • Status: 183 Session Progress but no ringing/alerting

    Hi all,

    New to the forums, good work been done here.

    I have been racking my brains aroudn this problem for a few weeks now.

    I have a Fanvil voip desk phone connected tot he 3cx pbx and when dialing numbers I get no ring alerting and B-end pciked up and starts talking. So I am not alerted by any form of ringing and wonder what is goign on here.

    Have got some pcap traces and see the following:

    "7","2017/320 15:53:23,150906","xx.yy.yy.xx","zz.uu.zz.uu","SIP/SDP","1198","Request: INVITE sip:000058842833471@zz.uu.zz.uu:5060 | "
    "8","2017/320 15:53:23,151318","zz.uu.zz.uu","xx.yy.yy.xx","SIP" ,"396","Status: 100 Trying | "
    "9","2017/320 15:53:23,165533","xx.yy.yy.xx","zz.uu.zz.uu","SIP/SDP","1198","Request: INVITE sip:000058842833471@zz.uu.zz.uu:5060 | "
    "10","2017/320 15:53:23,165740","zz.uu.zz.uu","xx.yy.yy.xx","SIP" ,"396","Status: 100 Trying | "
    "11","2017/320 15:53:23,380555","zz.uu.zz.uu","xxx.","SIP","600", "Status: 183 Session Progress | "

    My understanding is that after "183 Session Progress" the hand set should start to ring in the handset?

    So far have updated the 3CX Client to latest version, firmware on the Fanvil phone also updated. Issue still persits.

    Any advise appreciated.

  • #2
    Like to correct my previews post as I cant updated/edit it!

    When making a call through he 3CX PBX the alerting/ringing STARTS straight away, even before a "183 Session Progress SDP" is received.


    "1","0.000000","","","SI P/SDP","999","Request: INVITE | "
    "2","0.000285","","","SI P","366","Status: 100 Trying | "
    "3","0.006915","","","SI P/SDP","1197","Request: INVITE | "
    "4","0.034147","","","SI P","528","Status: 100 Trying | "
    "5","29.641111","","","S IP/SDP","878","Status: 183 Session Progress | "
    "6","29.650824","","","S IP/SDP","810","Status: 183 Session Progress | "

    See showing a SIP call trace, where my handset start ringing even before 183 is received.