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Calls routed to announcement

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  • #38155 Reply
    Ashish Goel
    Guest

    Hi everyone,

    This is Ashish. Can anyone tell me how a call routed to announcement is treated in CCS 7 network.

    i will give a scenario :

    Suppose i call a mobile subscriber from a landline number and the b party does not answer. Hence the call is routed to an announcement and the ringing tone is ended.

    My query is that what messages will be exchanged between A-Exch and B-exch on CCS7 and how the call will be treated : whether it will be an answered call or the call will be put in some other parameter of the traffic reports. If it is not an answered call then why.

    Also what are the various release causes sent in the REL message in CCS7.

    regards,

    Ashish Goel

    #38156 Reply
    Hitesh
    Guest

    1. Exhange A will send IAM meassage to Exch B
    2. Exchange B subscriber will start ringing & Exch B will send ACM (Address Complete) meassage to B
    3. As exch B get ACM it will switch Ring Back Tone to subscriber A
    4. After Ring timeout Exch B will send REL (Release) to Exch A with cause B party not replying.
    5. As Exch B get REL message it will disconnect RBT & play apprpriate announcement (Number U dialled is not replying)

    There are many REL causes (e.g Busy,No answer,congestion,unalloted numbere..etc..etc),Details can be found in ITU-T specs.

    #38157 Reply
    Jack Sparrow
    Guest

    Hi Hitesh,

    At what Conditons and Why the Announcements given from HPLMN and VPLMN ?

    Rgds

    Jack Sparrow

    #38158 Reply
    Ashish Goel
    Guest

    Hi Hitesh

    As you have written after the REL message the call is routed to announcement and an appropriate announcement is played. I suppose that moment the REL message is received by A side it will release the circuit and the call will be ended. Then how the announcement is heard after the release message is received.

    Bye

    Ashish Goel

    #38159 Reply
    Roameo
    Guest

    When the Terminating MSC recives the REL it sends an IAM to the announcement number. The REL is not relayed to the A-party.
    Cheers!
    R….

    #38160 Reply
    Hitesh
    Guest

    Announcement is played by Exch A ,not by B ie why after the release of trunk between Exch A and Exch B annc. can be listened by subscriber A.

    #38161 Reply
    Roameo
    Guest

    I am sorry, it was not the Terminating but the originating MSC.
    Cheers!
    R….

    #38162 Reply
    Ashish Goel
    Guest

    Hi Hitesh

    The announcement is played on CCS-7 trunks by A side. However if we make a call form PSTN (Landline) to a mobile subscriber then the ann. for mobile are not loaded into the PSTN switch but they are heard from B side i.e the Mobile switch. Can u discuss this issue.

    Bye

    Ashish

    #38163 Reply
    Roameo
    Guest

    I still feel the T-Switch is involved as part of the announcement since if A(Airtel) calls B(BPL-Mobile) and B is not reachable we get announcement saying BPL-Mobile subscriber is not available.
    Could you please confirm if the T-Switch is not a party how this announcement can be played by the Airtel originating MSC?
    Regards,
    Anant

    #38164 Reply
    Jack Sparrow
    Guest

    BPL Announcement Played by BPL.Not by AIRTEL.

    So Ex-B is the Party Who provides Announcement.And this is before GMSC Releasing the call.

    Whoever Calls GMSC is The Handling Party.

    Are you working in APL/AIRTEL in TamilNadu ?

    Then what is this T-Switch…?

    Rgds

    #38165 Reply
    Roameo
    Guest

    By T-Switch i meant the terminating switch/MSC.
    Rgds

    #38166 Reply
    Jack Sparrow
    Guest

    Anant…Are you from BPL- Cochin ?

    Rgds

    #38167 Reply
    Roameo
    Guest

    Nopes.

    #38168 Reply
    Jack Sparrow
    Guest

    Are u in India and where ?

    Rgds

    #38169 Reply
    Andrew
    Guest

    Hello,

    This topic is of interest to me aswell but I must admit I am lost guys 🙁

    Are you guys suggesting that the GMSC after receiving a REL message from the VMSC connects the calling party i.e. A party to an announcement device?

    Kind Regards

    Andrew

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