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What is the use of DUNA and DAVA message in M3UA, please explain with example?

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What is the use of DUNA and DAVA message in M3UA, please explain with example?
posted Jul 29, 2015 by anonymous

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+1 vote
How a SG selects through which association a DUNA or a SCON message sent.

This is regarding M3UA SSNM messages.
1. Take an ASP with 2 SCTP link sets with each link set having 2 associations, connecting to two different SGs.

| - - - - -> Link Set 1 (2 Associations) - - - - -> SG 1 - - - - - >|ASP | | HLR-1| - - - - -> Link Set 2 (2 Associations) - - - - -> SG 2 - - - - - >|

If all connections between SG-1 and the HLR-1 break, the ASP would be notified with a DUNA.My question is through which SCTP connection between the ASP and SG-1, the DUNA would be sent in a proper SG implementation?Would it be sent to both connections or to a randomly selected one ?

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As per RFC 4666 ------------------------
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