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Logical channel used for 2nd call?

  • This topic has 3 replies, 1 voice, and was last updated 12 years ago by pix.
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  • #63480 Reply

    Hi all,

    When we are on a communication, and when we have the “Bip Bip” telling us that there is an other call.
    I presume the “”Bip Bip is a signal sent from the MSC
    and we heard it through the TCH True or False?
    Or it is sent through SACCH to our MS, and then the MS elaborate and send the “Bip Bip”?
    Or sent through FACCH and then the MS elaborate and send “the Bip Bip”?

    2nd step
    Now I want to answer the second call, and put the first one on call waiting.
    So I push the button accept 2nd call:
    but which logical channel is used to carry the signal “I want to answer the second call”
    Thank you

    #63481 Reply

    All those messages are carried through the FACCH.
    The SACCH cannot be used for such signalling, its sole purpose is to carry “regular” messages.


    #63482 Reply

    thank you Pix
    I was thinking about that but I was not sure
    An other question:
    Perhaps you know what is the etsi document number that talk about that
    (info carried by Sacch and Facch, broadly speaking: all logical channels)
    And about the management of call waiting, I presume that the conferences Devices manage it in the MSC (in fact it should be something in the MSC, because when we change MSC service AREA without updating because we are on the call, the initial MSC (Anchor) should be able to route the call to the second MSC )

    #63483 Reply


    the logical channels are described in the series 44
    (001, 003, etc)

    but the description of the 2nd call and so on… it is going to be difficult.
    The process is probably described in a core network document, and the radio implementation is indirectly described somewhere else.

    Start reading 🙂


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