SIP Debug Error...

[vinoth b]

This is a call completion flow chart which i was not able to understand since its had Too many invite and Ack in the flow control.
Any one Pls help me in understanding this call completion flow control.
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|-----1638317648 INVITE--->|Jump
|<407 (1638317648 INVITE)--|Jump
|------1638317648 ACK----->|Jump
|-----1638317649 INVITE--->|Jump
|<100 (1638317649 INVITE)--|Jump
|<183 (1638317649 INVITE)--|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<200 (1638317649 INVITE)--|Jump
|------1638317649 ACK----->|Jump
|<-------27254 BYE---------|Jump
|------200 (27254 BYE)---->|Jump
|<-------27254 BYE---------|Jump
|------200 (27254 BYE)---->|Jump
|<-------27254 BYE---------|Jump
|------200 (27254 BYE)---->|Jump
|<-------27254 BYE---------|Jump