Corporate QoS Baseline standard, which requires that the audio and video channels of a video call both be marked as CoS 4 (IP Precedence 4 or PHB AF41). The reasons for this recommendation include, but are not limited to, the following:
• To preserve lip-sync between the audio and video channels
• To provide separate classes for audio-only calls and video calls
Cisco Collaboration System 12.x Solution Reference Network Designs SRND
Chapter 3: Network Infrastructure
QoS Marking Differences Between Video Calls and Voice-Only Calls
The voice component of a call can be classified in one of two ways, depending on the type of call in progress. A voice-only telephone call would have its media classified as CoS 5 (IP Precedence 5 or PHB EF), while the voice channel of a video conference would have its media classified as CoS 4 (IP Precedence 4 or PHB AF41). All the Cisco IP Video Telephony products adhere to the Cisco Corporate QoS Baseline standard, which requires that the audio and video channels of a video call both be marked as CoS 4 (IP Precedence 4 or PHB AF41). The reasons for this recommendation include, but are not limited to, the following:
To preserve lip-sync between the audio and video channels
To provide separate classes for audio-only calls and video calls
All the Cisco IP Video Telephony products adhere to the Cisco Corporate QoS Baseline standard, which requires that the audio and video channels of a video call both be marked as CoS 4 (IP Precedence 4 or PHB AF41). The reasons for this recommendation include, but are not limited to, the following:
To preserve lip-sync between the audio and video channels
To provide separate classes for audio-only calls and video calls
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