Audio and Video calls...QoS

[Pascal Blumenthal]

Hello

I have some questions about QoS for Video and or Audio Calls with Cisco IP Phones...

I know that the QoS DSCP value for Audio calls is "EF" and our QoS configuration is setting up for Audio calls.

Now we like to activate Video as well and I know that the DSCP value is AF41.

When we make a video call, audio is "integrated" and the DSCP is set to AF41.

1. Is it possible to switch back to a simple audio call during a video call?

2. Can I choose before I make a call if I like to call with or without video?

3. When I stop the cam during a call with the specific button, do we still use the "AF41" DSCP value

or will the phone switch to the DSCP "EF" value?

Thank you already for your answers and suggestions.

Wish you a nice day.

Regards,

Pascal

[Hermanus Janse van Vuuren]

May this will explain it all to you better:

http://www.cisco.com/web/about/ciscoitatwork/downloads/ciscoitatwork/pdf/Cisco_IT_Case_Study_QoS_print.pdf

[Nadeem Ahmed]

Hi Pascal,

Video and Voice streams are created separately in a video call.. since they terminates on different RTP ports.

That means in a video call, you have both "EF" ( i.e voice) and "AF41" ( i.e. Video) packets on the network and are tagged irrespective of each other. Having said that, here are your answers:

1. Is it possible to switch back to a simple audio call during a video call?

Yes, you can go to preferences > Video and OFF the video.. It will stop the video stream..

2. Can I choose before I make a call if I like to call with or without video?

Yes, you can go to preferences > Video and OFF the video.. It will stop the video stream..

3. When I stop the cam during a call with the specific button, do we still use the "AF41" DSCP value

or will the phone switch to the DSCP "EF" value?

When you stop webcam, you still have the video streams but it like sending blank video.. so you still would have AF41 DSCP value..

Hope this helps you.

Br,
Nadeem 

Please rate all useful post.

[Nadeem Ahmed]

Just to add a small thing to the last point, you can stop AF41 values during a  call by disabling video from

'preferences > Video and OFF the video'.

Else if you just hit the button with a crossed cam icon on it then as mentioned above, it will be like sending blank video packets.

Br,
Nadeem 

Please rate all useful post.

[Pascal Blumenthal]

Hi Nadeem

Thank you for your answers...

That means that our actual QoS configuration for the Access Switches (see below) is just marking voice traffic and signaling...

class-map platinum

match ip dscp ef

!

class-map silver

match ip dscp cs3

!

mls qos

mls qos map cos-dscp 0 8 16 26 32 46 48 56

mls qos map ip-prec-dscp 0 8 16 26 32 46 48 56

mls qos srr-queue output cos-map queue 1 threshold 1 5

mls qos srr-queue output cos-map queue 2 threshold 1 0

mls qos srr-queue output cos-map queue 3 threshold 1 3

mls qos srr-queue output cos-map queue 3 threshold 2 6 7

mls qos srr-queue output cos-map queue 4 threshold 1 4

mls qos srr-queue output dscp-map queue 1 threshold 1 46

mls qos srr-queue output dscp-map queue 2 threshold 1 0

mls qos srr-queue output dscp-map queue 3 threshold 1 24

mls qos srr-queue output dscp-map queue 3 threshold 2 48 56

mls qos srr-queue output dscp-map queue 4 threshold 1 32

mls qos queue-set output 1 threshold 1 400 400 100 400

mls qos queue-set output 1 threshold 2 3200 3200 100 3200

mls qos queue-set output 1 threshold 3 400 400 100 400

mls qos queue-set output 1 threshold 4 400 400 100 400

mls qos queue-set output 1 buffers 5 80 15 0

!

policy-map Input-Policy

class platinum

police 1000000 8000 exceed-action drop

  set ip dscp ef

class silver

  police 1000000 8000 exceed-action drop

class class-default

  set dscp default

!

!

int range gigabitEthernet 1/0/1 -48

mls qos trust dscp

service-policy input Input-Policy

!

The video traffic isn't trusted and not covered with QoS. Right?

If I like to mark the video traffic to, what I need to configure or what I have to modify at the actual config?

Thank you for your help.

Kind regards,

Pascal

[Hermanus Janse van Vuuren]

Have a look at this.

http://www.cisco.com/en/US/docs/switches/lan/catalyst2960x/software/15.0_2_EX/qos/configuration_guide/b_qos_152ex_2960-x_cg_chapter_011.html#ID4968

Examples: Auto-QoS Generated Configuration For Enhanced Video, Trust, and Classify Devices

If  you entered the following  enhanced auto-QoS commands, the switch  configures a CoS-to-DSCP map (maps CoS values in incoming packets to a  DSCP value):

• auto qos video cts
• auto qos video ip-camera
• auto qos video media-player
• auto qos trust
• auto qos trust cos
• auto qos trust dscp The following command is initiated after entering one of  the above auto-QoS commands:

  
  Switch(config)# mls qos map cos-dscp 0 8 16 24 32 46 48 56
  
  

  Note	No class maps and policy maps are configured.

If you entered the auto qos classify command, the switch automatically creates class maps and policy maps (as shown below).