I have a question.
We recently deployed a solution that involves VoIP. The VoIP isn't a cisco solution, but we are using a Cisco 1841. We are configuring QoS on the router. ISP says that we need to tag voice traffic with Class of Service 4.
This is my policy map:
set cos 4
priority percent 60
However, when I went to apply the service-policy output voice_cos command to the serial interface, it said this:
Router(config-if)#service-policy output voice_cos
Process 'set' action associated with class-map voice_cos failed:
Set cos supported only with IEEE 802.1Q/ISL interfaces
So, my question is, can I not set a CoS on a serial interface?
It's my understanding that I need to set CoS on the serial interface so that routers later down the line knows to prioritize the traffic. I know that there are other ways of marking traffic - such as DSCP, but the ISP specifically said that it should have Class of Service 4.
Any suggestions or feedback would be appreciated.
I attached the config. 192.168.2.240 is my internal VOIP PBX. The pbx is hybrid. Internal phones talk to it trough traditional lines. It talks to ISP through VoIP.