Example FXS voice port configuration for UK phone handset:


voice-port 0/2/0
description VP-FXS | Mail Room | +441224987654
signal loop-start
cptone GB (sets call progress tone specific to country code)
ring-cadence pattern# (not required if cptone is configured)
busy-out (effectively shut port down, continuous busy tone)
station-id name Mail Room 7654 (name send to called party)
station-id number 7654 (number sent to called party)



Example configuration of FXO port for BT PSTN line




voice-port 0/1/0
description VP-FXO | BT PSTN | +441224567890
signal loop-start 
ring number 3 (postpones answer until 3rd ring)
dial-type dtmf (determines dialing type from calling party)