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class-map voice-priority

We are replacing a router. I saw the following lines in the config. Can someone clarify what the following are for?

1. priority 512

2. why are there TCP ports for mapping voice packets?

class-map voice-priority

match access-group 150

policy-map POLICY1

class voice-priority

priority 512

class class-default

fair-queue

access-list 150 permit udp any any range 5000 5070

access-list 150 permit udp any range 5000 5070 any

access-list 150 permit udp any any eq 5567

access-list 150 permit udp any eq 5567 any

access-list 150 permit tcp any any eq 5566

access-list 150 permit tcp any eq 5566 any

access-list 150 permit tcp any any eq 5570

access-list 150 permit tcp any eq 5570 any

access-list 150 permit udp any any eq 16384

access-list 150 permit udp any eq 16384 any

access-list 150 permit tcp any any eq 2427

access-list 150 permit tcp any eq 2427 any

access-list 150 permit udp any any eq 4000

access-list 150 permit udp any eq 4000 any

access-list 150 permit udp any any eq 4010

access-list 150 permit udp any eq 4010 any

1 REPLY
Cisco Employee

Re: class-map voice-priority

Said,

Priority 512 is basically having the router dedicate 512K for the traffic matching the class voice-priority. In your case, all traffic that matches access-list 150. And if I remember correctly, I think TCP Port 5566 is used for call signaling.

You can look at the access-list counters to see if the phones are using those TCP ports or not. Just a thought.

Regards,

Arul

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