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access-list 100 permit ip host 192.168.1.1 host 10.0.0.87
access-list 100 permit tcp any host 10.0.0.87 eq 23
access-list 100 permit udp any any range 16384 32768
access-list 100 deny ip any any
ip address 10.0.0.87 255.255.255.0
ip access-group 100 in
COR (class of restriction)是Cisco IOS 内置的用来实现呼叫权限管理的特性，它能够帮助我们用来防止面向PSTN的hairpin的呼叫的发生，配置案例如下。
dial-peer cor custom
dial-peer cor list PSTN
dial-peer cor list All
dial-peer voice 101 pots
corlist incoming PSTN
description "matched all Incoming calls"
incoming called-number .T
dial-peer voice 102 pots
corlist outgoing All
description "matched all Outgoing calls"