Convert IP precendenc 6 on inbound interface to 5 on outbound interface

[hks10]

Need some Assistance! I'm trying to convert or mark my VoIP packets on my router for my VoIP packets from 6 to 5. Need some assistance on how I should accomplish this. My ISP only identifies 5 for VoIP. How can I mark the packets to 6 on inbound interface and send out 5 on the outbound. Any help would be appreciated. Thanks!

[Chris Deren]

First of all why are you trying to mark packets with IP precedence of 6? by default Cisco IP Phones mark the RTP packets with DSCP 46 (IP Precedence 5).

To aswer your question on the remarking, you can create an ACL that matches all voice VLAN RTP UDP port range and remark it with IP precedence of 5, such as:

ip access-list extended RTP

permit udp any any range 16384 32767

class-map match-any CGC-VOIP

match ip dscp ef

match access-group name RTP

policy-map VOIP

class CGC-VOIP

set ip precedence 5

priority percent 25

class CGC-VOICE-CONTROL

bandwidth percent 5

class class-default

fair-queue

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Chris