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etherchen | 19 Aug 2011 05:17
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Sent 18x with 'require:100rel' but no PRACK recieved

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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honsha.narayan | 19 Aug 2011 12:12

Re: Sent 18x with 'require:100rel' but no PRACK recieved

Hi ,

 

First of all , please use "sip-implementers (sip-implementors <at> cs.columbia.edu)" forum for the answer of this query.

 

As per SIP RFC3262, you must reject the call in SIP side with 5xx ( provided you had SDP in reliable 18x ). You can reject ISUP side with a RELEASE message.

 

But if you want to relax your software compliance a bit here , you can do that,  but remember your early media negotiation may be in trouble. If you are sure that on ISUP side the call is answered ( ANM is received ) you can proceed for sending 200 to SIP side.

 

Regards

Honsha

 

From: sip-bounces <at> ietf.org [mailto:sip-bounces <at> ietf.org] On Behalf Of etherchen
Sent: Friday, August 19, 2011 8:48 AM
To: sip
Subject: [Sip] Sent 18x with 'require:100rel' but no PRACK recieved

 

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.

_______________________________________________
Sip mailing list  https://www.ietf.org/mailman/listinfo/sip
This list is essentially closed and only used for finishing old business.
Use sip-implementors <at> cs.columbia.edu for questions on how to develop a SIP implementation.
Use dispatch <at> ietf.org for new developments on the application of sip.
Use sipcore <at> ietf.org for issues related to maintenance of the core SIP specifications.
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Gmane