The Cisco Unified CM currently provides MLPP capability over the SIP Trunk for DSN/DRSN namespaces as defined by RFC4412; however it is geared to DoD requirements. Three namespaces are defined by the draft to cater to different service domains:
dsn--Adopted by U.S. Defense Switched Network and DISA. It defines five precedence values: routine, priority, immediate, flash, flash-override.
q735--Used by Signaling System 7 (SS7) networks based on ITU Q.735.3. It also defines five precedence values: 4, 3, 2, 1, 0.
drsn--Used in U.S. DRSN. It defines six precedence values: routine, priority, immediate, flash, flash-override, flash-override-override.
With this being described in Cisco documents, I am not sure whether it can work between to private SBC's. To confirm the functionality, you can open a Cisco TAC case.
Please rate helpful posts and if applicable mark "Accept as a Solution". Thanks, Vaijanath S.
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