DRAG DROP
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Explanation/Reference:
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Cisco 642-437 Exam
The one thing that distinguishes a PRI from other interfaces is the fact that the data that is received fromthe PSTN on the D-channel and needs to be carried in its raw form back to the Cisco CallManager to beprocessed. The gateway does not process or change this signalling data, it simply passes it onto the CiscoCallManager through TCP port 2428. The gateway is still responsible for the termination of the Layer 2 data.That means that all the Q.921 data-link layer connection protocols are terminated on the gateway, buteverything above that (Q.931 network layer data and beyond) is passed onto the Cisco CallManager. Thisalso means that the gateway does not bring up the D-channel unless it can communicate with CiscoCallManager to backhaul the Q.931 messages contained in the D-channel. http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00801da84e.shtml