Hi All,

 

Is is mandatory that the To Tag must be included by the UAS in the
200OK(CANCEL) even if the dialog is not established yet? I.E, as below:

 

UAC                         UAS

 |---------- Invite ------------------------------->|

 |<--------- 100 Trying -------------------------|

 |----------- CANCEL ------------------------->|

 |<----------- 200OK(CANCEL, To Tag)-----|                      

 

alex

 

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