Hi,

I need an urgent clarification on the followings set
of call.I have observed the following scenario on the
real network and it confuses me when i see the two
INVITES having same TO,FROM,CSEQ,CALLID (but different
VIA) in opposite direction :

I am trying to give the scenario below :

|Time     | 1.1.1.1           | 2.2.2.2           |

|0.000    |         INVITE    |                   |SIP
From: sip:[EMAIL PROTECTED] 
To:sip:[EMAIL PROTECTED]
|         |(5060)   ------------------>  (5060)   |

|0.000    |         100 Trying|                   |SIP
Status
|         |(5060)   <------------------  (5060)   |

|0.000    |         INVITE    |                   |SIP
Request
|         |(5060)   <------------------  (5060)   |

|0.000    |         100 Trying|                   |SIP
Status
|         |(5060)   ------------------>  (5060)   |

|0.000    |         180 Ringing                   |SIP
Status
|         |(5060)   ------------------>  (5060)   |

|0.000    |         200 OK    |                   |SIP
Status
|         |(5060)   ------------------>  (5060)   |

|0.000    |         ACK       |                   |SIP
Request
|         |(5060)   ------------------>  (5060)   |

|0.000    |         ACK       |                   |SIP
Request
|         |(5060)   <------------------  (5060)   |

|0.000    |         BYE       |                   |SIP
Request
|         |(5060)   ------------------>  (5060)   |

|0.000    |         BYE       |                   |SIP
Request
|         |(5060)   <------------------  (5060)   |

|0.000    |         200 OK    |                   |SIP
Status
|         |(5060)   ------------------>  (5060)   |


I am not sure whether the figure would be that clear
or not .Here I am mentioning the first 3 SIP messages 

Please see the attachment for more description.

Regards
Atul





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Attachment: SIP_INVITE.doc
Description: 3092052022-SIP_INVITE.doc

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