what you would need is priority queueing for your fax traffic. One way of accomplishing it would look like this:
class-map match-all FAXtraffic
match protocol rtp
priority percent 20
ip address ...
service-policy output LLQ
You need to adjust your bandwidth statements and percentage values to suit your requirements. The "priority" command will ensure lowest delay, but be aware that a policer comes with it and you have to make sure to configure enough resources to support your FAX traffic.
The class-map could also be set up with an access-list. Just make sure your fax traffic is properly described.
For a full description of available commands and configuration examples have a look at "Cisco IOS Quality of Service Solutions Configuration Guide"
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