QoS for Skype

Skype qos is difficult especially that it doesn't use specific ports for the VoiP channel. but check this they discuss the same question as yours.

https://supportforums.cisco.com/discussion/12171621/qos-skype

class-map priority
  match protocol skype

According to the link, there is protocol "skype" available?  Thanks

I am not sure if it's a built in protocol ... I guess he created it himself thats why he mentioned it didn't work properly.

if I need following port for more bandwidth, what will be the command?
TCP 443, UDP 3478, TCP/UDP 50,000-59,999

do I have to create each port assigned like this?
permit udp any range 50000 59999 any
permit udp any any range 50000 59999

thanks in advance

Are you using skype for business or skype? the ports you mentioned are for skype for business not Skype as far as I know ..

what's your cisco firewall model?

yes. i am using skype for business and cisco 1920.

Skype for business is not an internet service and do not use random ports ...

HP provides the solution for free for basic QoS functionalities .. and btw Microsoft recommends the following to prioritize traffic:

Using Quality of Service (QoS) by marking traffic with DSCP.
Using network equipment that can leverage Software Defined Networking (SDN) and integrate it with the SDN API that Lync/Skype for Business offers

please check here for more
https://blogs.technet.microsoft.com/rischwen/2015/06/15/lync-2013-and-skype-for-business-2015-client-rtprtcp-changes/

I have used HP SDN VAN Controller (I have written an article on how to install the machine and configure the QoS part). I will try to publish it today on my website and provide you a link if you'd like to use it. it works on Ubuntu server and it's pretty stable.

I would love to see your website and learn more about it. HP SDN VAN Controller may be too much for our company.   Could you give me an example of DSCP?
Is it something like this? I am not sure how to use DSCP yet.
class-map match-any Skype
 match ip precedence 3
 match  dscp cs3
 match  dscp af31
 match protocol sip

Thanks

Thanks for your help.  It helps me to where to start. Thanks