Subject: [Megaco] Megaco Call Flow

From: "Deepan Pavendranathan" <[email-masked]>
Date: Thu, 06 Jun 2002 15:22:46 +1000

Hi list,

I was confused about a particular issue relating to the RGW to RGW call flow in Megaco.

On page 5 of the <draft-madhu-megaco-callflows-00> document, the RGW-to-RGW call flow it indicates that the User A (the calling party) is sent the ringback tone before User B’s (the called party) phone starts ringing.

|            |           |           |                   |

|----------->|           |           |                   |

|User Dials Digits       |           |                   |

|            |---------->|           |                   |

|            |Notify digits          |                   |

|            |<----------|           |                   |

|            |Notify Response        |                   |

|            |<----------|           |                   |

|            | Add TermA SD:ringbacktone                 |

|            | Add $, Local SDP Info -underspecified     |

|<-----------|           |           |                   |

|RingBack Tone           |           |                   |

|            |---------->|           |                   |

|            |Modify Resp TermA      |                   |

|            |Add Resp Local SDP (Specified)             |

|            |           |---------->|                   |

|            |           |Add TermB SD:Ring ED:offhook   |

|            |           |Add $ Local(Underspecified)    |

|            |           |     Remote SDP (Specified)    |

|            |           |           |                   |

|            |           |           |------------------>|

|            |           |           | UserB Phone Ringing

Is this correct?

How can the MGC know that User B is available? Maybe I have overlooked something.

Thanks in advance.

Deepan Paven

School of EE&T

University of New South Wales

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