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For audit PC inventory originating on a Cisco voice gateway router, H.323, Media Gateway Control Protocol (MGCP), and Session Initiation Protocol (SIP) traffic can be marked by the source gateway. For a long time, only IP Precedence marking was available for VoIP dial peers, and this only for media (voice) packets. In early releases, ACLs were required to mark call-signaling packets in conjunction with class-based marking
Cisco IOS Software Release 12.2(2)T introduced the capability to mark voice-sourced packets on the voice gateway with DSCPs, together with the capability to mark signaling packets separate from media packets and to mark voice traffic that did not use dial peers (such as MGCP). The following commands were introduced as part of the simplification of QoS. They are used for marking the voice traffic at its source, which is more efficient and easier to manage than manually marking such traffic on the nearest network audit PC inventory
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