Hi I have seen some discussion happened on this topic in the following mail trail, but still not clear with one thing: https://lists.cs.columbia.edu/pipermail/sip-implementors/2003-December/0 05829.html Is there any use case where we receive second REFER message that creates a subscription while there exists an already an 'active' REFER subscription in the same dialog? RFC 3515 has given a use case by saying that "If more than one REFER is issued in the same dialog (a second attempt at transferring a call for example)". But in the above scenario, I assume that the first attempt to call transfer has failed (i.e. first REFER subscription terminated). Please clarify me. Regards Srikanth
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