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Quality of Service (QoS) is designed to deliver a certain Quality of Experience (QoE) by ensuring that network elements apply consistent treatment to traffic flows as they traverse the network. Multiple factors contribute to user’s experience of voice:
The SBC Core uses two profiles to measure the signaling QoS parameters against IP trunk groups and provide input back to the control system to provide better perceived QoE.
To set Egress IP Attributes of Signaling Qos KPI Profile in an IP Signaling Profile:
To enable QoS-based routing for an IP Signaling Profile:
To enable QoS-Based routing on a global level:
Differentiated services Code Point (DSCP) is a networking architecture specifying a simple and scalable mechanism for classifying and managing high-priority network traffic and providing quality of service (QoS) on modern IP networks. DSCP prioritizes certain packets in a stateless fashion, scales well and does not require many processing cycles.
The SBC Core supports passing through DSCP values where multiple DSCP values are used based on the session. The DSCP pass-through capability applies to text, audio, video, image/T38, RFC 2833 RTP pay load, transcoded, pass-through, RTCP, SRTP, GW-GW and H.323 media streams. This applies to both IPv4 and IPv6 media streams.
The SBC Core supports using preconfigured DSCP values for egressing audio and video packets (configured separately for audio and video). Prior to the 5.0.0R0 release, the audio DSCP value was also applied to MSRP packets. The SBC now supports setting a separate MSRP DSCP value in the Packet Service Profile (PSP) for egressing MSRP packets. This configurable value,
msrpDscp, applies to egress MSRP packets only and does not rely on the values configured for audio/video streams.
The SBC Core supports specifying an alternative DSCP marking to use for T.140 text media streams from what is used for video and audio media stream types. This value applies irrespective of whether the request has a Resource Priority header (RPH).
To configure the DSCP marking for text calls, execute the following command: