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supports dialog stateful variables to allow storing values during SMM processing of messages, and then later using the same values for SMM processing of the other messages in the same dialog.
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supports dialog stateful variables for INVITE, REGISTER, and Out-of-Dialog SUBSCRIBE messages. The values of stateful variables are preserved for the active dialogs. These values are accessible during the SMM rule processing on the subsequent messages.

  • The dialog stateful variables don't  support NOTIFY messages, which are received prior to receiving the 200 OK response to the Egress SUBSCRIBE.
  • In case of REGISTER message, dialog stateful variables are accessible by refresh REGISTER requests but not by INVITE/SUBSCRIBE sent for a registered user. The refresh-REGISTERs are expected to have same call-id as that of initial REGISTER.

Advanced SMM examples:

 

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