Hi all,

I have read rfc2976 - The SIP INFO Method, but I haven't really understood that INFO message belongs only to INVITE dialog usage, which however draft-ietf-sipping-dialogusage-04 claims in its part 5.3:


     5.3. Matching requests to usages



  For many mid-dialog requests, identifying the usage they belong to is
  obvious.  A dialog can have at most one invite usage, so any INVITE,
  UPDATE, PRACK, ACK, CANCEL, BYE, or INFO requests belong to it.

So my, question is:
Can INFO message belong to other usages, besides INVITE, such are SUBSCRIBE or REFER?

Thanks in advance,
Nina.

--
Nina Garaca
Software Development & Testing

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