Welcome Trunk Problem on Outgoing Call Double 183 Session Progress

Discussion in '3CX Phone System - General' started by atik, Dec 21, 2017.

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  1. atik

    Mar 29, 2010
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    We have new Voip Provider "Welcome" on some customer with some problem,
    many problem resolved, but one problem STILL.

    When Outgoing Call Provider reply me:
    SIP 100 Trying
    SIP 183 Session Progress
    SIP/SDP 183 Session Progress,

    all other provider send us after 100 Trying, 183 SIP/SDP with Call result

    with "Welcome Provider" Receiving Immediatly Only "SIP 183 Session Progress", and 3CX send Fake RING to Phone, not wait Call Result received with SIP/SDP a few second later

    i don't know how to tell to 3CX to wait SIP/SDP signal and not send Fake Ring to Phone.

    Anyone Help ME ?

    Thanks - Roberto - Atik Srl
  2. YiannisH_3CX

    YiannisH_3CX Support Team
    Staff Member 3CX Support

    May 10, 2016
    Likes Received:
    Hello @atik

    I would recommend using a supported provider to avoid these kind of issues. You can see a list with supported providers here.
    There is no way to change the behaviour of the PBX on this matter. Since the PBX receives a 183 Session Progress it will send Ringing to the endpoint.
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