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Regarding BUSY tone we get from network.

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  • #57650 Reply

    Dear all,
    Myself vivek,completely new person for this forum.i m very much impressed with the quality of discussion. There are some questions which i m unable to find the answers..hope will get reply from u experts.

    Question:Whenever we make call to such mobile no which is already in call,and we get announcement that subscriber is question is in this paging is done or not for this particular no
    as this no is already paged by the network. and second question is where network looks (parameters/terms)before declaring that no BUSY? hope for quick reply..

    #57651 Reply

    experts plz answer..

    #57652 Reply

    Simply say :
    1)Network >> MS Paging
    2)MS >> Network paging_Response
    3)Network >> MS Setup
    4)Busy MS >> Network – see extract from etsi 24.008-008

    “A busy MS which satisfies the compatibility requirements indicated in the SETUP message shall respond either with a CALL CONFIRMED message if the call setup is allowed to continue or a RELEASE COMPLETE message if the call setup is not allowed to continue, both with cause #17 “user busy”. “

    #57653 Reply

    Plese explain in detail..

    #57654 Reply

    hello Mik and Vivek,

    i need someone to confirm what I’m saying : the network shall not “page” the busy mobile, because the MS is already in dedicated mode. There is no need for paging… The MSC will start establishing the connection immediatly.

    Therefore, IMO, the MS receives a Call Setup message on the FACCH, directly, without Paging. And MS could reply with either CALL CONFIRMED or RELEASE (as explained by Mik, because I have no knowledge about that).

    #57655 Reply

    Dear, Pix, Mik and Vivek!
    There are two cases:
    1) Network Determined User Busy (NDUB);
    2) User Determined User Busy (UDUB).
    In case 1) there is no any signalling between MS-B and Network when MS-B is envolved in call and Call Waiting supplementari service is inactive.
    If Call Waiting is active then network handles signalling on FACCH (Facility IE with Call Waiting indication).
    Case 2) may arise when subscriber B rejects the second call with Call Waiting indication or when subscriber B not envolved in any call rejects a new call.

    #57656 Reply

    Thanks 3GPP Zen Master 🙂

    #57657 Reply

    🙂 Thank you. You may see about User busy conditions (and point of)

    #57658 Reply

    Dear, Moderator!!!:) ….. detection in MSC (NDUB) during MT call in 23.018 (Procedure Page_MS_MSC).

    #57659 Reply

    Dear Moderator!
    Is it “det?rmination” is forbidden word?

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