As per RFC 3261, SIP Trapezoid
UAC1 - INVITE - UAS1
UAS1 - INVITE - UAS2
UAS1 - 100 Trying - UAC1
But i tried to check logs in SER which shows
UAC1 - INVITE - UAS1
UAS1 - 100 Trying - UAC1
UAS1 - INVITE - UAS2
Why is it different.
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