This is the design of a simple mobile phone operating system, a detailed working principle and the definition of a detailed workflow, the final draw of the MSC and SDL diagram

简易手机系统设计.doc
简易手机软件系统
................\call_failed_1.msc
................\call_failed_2.msc
................\call_handle.sbk
................\call_manage.spr
................\call_success.msc
................\call_success.sdt
................\call_success.sdt.state
................\Mobile.ssy
................\Mobile_contral.sbk
................\mobile_sys.ssy
................\Mobi_sysle.ssy
................\pac.sun
................\pac1.sun
................\receive_then_hook_on.msc
................\ring_timeout.msc
................\talking.spr

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