Характеристика запросов SIP, страница 5

  |<----200 OK --------|                                                                                                            |

  |--------ACK-------->|----------------------------------------ACK----------------------------------------->|

  |===========мул |ьтимедийный поток====================================|

  |===========....... |..................................=====================================|

  |===========мул |ьтимедийный поток====================================|

  |                                 |<------------------------------------------BYE---------------------------------------|

  |<------BYE ----------|                                                                                                                        |

  |------200 OK------->|                                                                                                                        |

  |                                 |---------------------------------------------200 OK--------------------------------->|

сценарии организации связи для дополнительныз услуг

(1) переключение связи

[A]                  [B]                  [C]

  |<--INVITE---|                       |

  |-- 200 OK--->|                       |

  |<----ACK-----|                       |

  |-BYE(loc:c)->|                      |

  |<--- 200 OK --|                      |

                           |--INVITE-->|

                           |<--200 OK --|

                           |----ACK---->|

(2)переадресация

[A]                  [B]                  [C]

  |---INVITE-->|                       |

  |<-100 Trying-|                      |

  |<--INVITE---|                       |

  |-----OK------>|                       |

  |<-----BYE-----|                      |

  |-----OK------>|                       |

  |--------------INVITE--------->|