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CTI Traffic between CUPC and CUCM

I find that CUPC does not mark DSCP CS3 to the CTI(2748) traffic to CUCM when I capture the traffic from the CUPC. But in the SRND, it's mentioned that "Cisco Unified Personal Communicator marks call signaling traffic with a vale of DSCP 24(PHB CS3),Cisco Unified Personal Communicator marks call signaling traffic with a vale of DSCP 24(PHB CS3)" .  So actully the CTI(2748) is not a call signaling ? But I notice that CUCM would mark CS3 to CTI traffic, which means CUCM treat CTI(2748) as a call signaling.

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