[Sip] Sent 18x with 'require:100rel' but no PRACK recieved

" etherchen " <etherchen@foxmail.com> Fri, 19 August 2011 03:17 UTC

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From: "=?ISO-8859-1?B?ZXRoZXJjaGVu?=" <etherchen@foxmail.com>
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Date: Fri, 19 Aug 2011 11:17:39 +0800
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Subject: [Sip] Sent 18x with 'require:100rel' but no PRACK recieved
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   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.