Характеристика запросов SIP, страница 4

  |------------------------------------------INVITE------------------------------------------------------------>|

  |<---------------------------------------100 Trying -----------------------------------------------------------|

  |----------------------------------------- 180 Ringing ------------------------------------------------------->|

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

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

  |===========мультимедийный поток=====================================|

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

  |===========мультимедийный поток=====================================|

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

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

(2)

[A]                  [PROXY сервер]                 [сервер определения местоположения]             [B]

  |------INVITE------>|                                                                       |                                                |

  |                                 |-запрос определения местоположения>|                                                |

  |                                 |<--------ответ о местоположении----------|                                                 |

  |                                 |-----------------------------------INVITE------------------------------------------>|

  |                                 |<------------------------------- 180 Ringing ----------------------------------------|

  |<----180 Ringing---|                                                                                                                        |

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