priority queuing for voice

[saidfrh]

Hi,

What is the protocol type for voice? We are configuring a router and would like to designate voice traffic as high priority with all other traffic as medium priority.

router(config)# access-list 101 permit tcp any any eq ???

Thanks.

[mounir.mohamed]

RTP communications occur on an even UDP port, VoIP traffic uses a well-known UDP port range, 16384-32767. While the actual ports used are dynamically negotiated between end-devices or gateways, For UDP and similar protocols, RTP uses an even port number and the corresponding RTCP stream uses the next higher (odd) port number.

Example:

access-list 100 permit udp any any range 16384 32767

OR

Class-map test

match protocol rtp audio

here is the RFC for RTP.

http://www.ietf.org/rfc/rfc1889.txt

So far now you should understand which traffic shall you classify, the next step is which Qos method will you use, Legacy, MQC...etc

Pls rate helpful posts.

Best Regards,

Mounir Mohamed