Hi:
I'm facing a ISUP - SIP interworking issue recently.
I receive INVITE from remote SIP server and send IAM to ISUP side, ISUP reply
ACM/CPG and then I send 18x with 100rel out, but I did not receive any PRACK
from remote SIP server, and I re-send 18x to them. During this period, ISUP
side send ANM to me.
If connect the call, but my end haven't receive PRACK yet, it become a
unreliable call.
If disconnect the call, I should not base on ANM to release a call.
If continue 18x re-transmission untill time-out, it will have charging issue.
Because ISUP side start billing base on ANM already, but my SIP side haven't
start charging because not answer.
Thanks.
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