Hi, All:
  I read the RFC3398(Integrated Services Digital Network (ISDN) User Part (ISUP) to Session Initiation Protocol (SIP) Mapping) And I can't find any information on how to map CHG(Charging Information Message) to SIP or SIP to CHG.
  I have 2 choice to solve this problem:
  1  Encapsulate a CHG in  INFO message. But this INFO message will send befored the INVITE transation terminated and will increase the complexity of our SIP stack
  2  Encapsulate a CHG in  18x. which kind of response code can i used 
  Can any body tell me which one is a better solution for this problem 
Best Regard
Link.Xie

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