Fövonal lesz, konfig:

interface BRI1/0
description VOICE ISDN BRI PORT 1.
no ip address
isdn switch-type basic-net3
isdn overlap-receiving T302 5000
isdn protocol-emulate network
isdn layer1-emulate network
isdn incoming-voice voice
isdn sending-complete
isdn static-tei 0
isdn skipsend-idverify
line-power
!

voice-port 1/0/0
echo-cancel coverage 32
compand-type a-law
cptone HU
timeouts interdigit 5
description VOICE ISDN BRI PORT 1.
!

dial-peer -ek szokásos, az nem számit.