I think that you are looking for this one, since I have never seen the one that you mencioned:
To add a Progress Indicator (PI) in an incoming ALERTING messages during ISDN B-channel cut-through, use the isdn incoming alerting add-PI command in interface configuration mode. To remove the indicator, use the no form of this command.
isdn incoming alerting add-PI
no isdn incoming alerting add-PI
The isdn incoming alerting add-PI and no isdn incoming alerting add-PI commands provide a way for switch types conforming to different standards to handle B-channel cut-through. These commands apply to both ISDN BRI and PRI connections.
North American switch types such as the 5ESS, 4ESS, DMS, and NI allow cut-through when an ALERTING message is received. ISDN B-channel cut-through for customer premises equipment (CPE) should happen upon receipt of a channel ID Information Element (IE) in the CALL_PROC message. For this reason, the default on North American ISDN switches is to add the PI in incoming ALERTING message.
On ETSI-compliant ISDN switches, the default behavior is to not add the PI in incoming ALERTING messages. But ETSI also specifies that when the remote device is playing tones or announcements, it should also include the PI in the ALERTING message. This is not the default behavior for ETSI-compliant switches, but the isdn incoming alerting add-PI command allows Cisco IOS software to support this behavior.
The isdn incoming alerting add-PI and no isdn incoming alerting add-PI commands can be used on switches that do not want to add the PI in incoming ALERTING messages and on those switches that cannot handle or do not want the PI in incoming ALERTING messages.
Examples
Because the the isdn incoming alerting add-PI command is the default for a North American ISDN switch, the following example shows that when the interface configuration is displayed, the isdn incoming alerting add-PI command is not listed, even if it was explicitly configured:
Router(config)# interface BRI1/0
Router(config-if)# no ip address
Router(config-if)# isdn switch-type basic-dms100
Router(config-if)# isdn spid1 40876726760101 5459374
Router(config-if)# isdn spid2 51076726760101 5459375
Router(config-if)# isdn incoming-voice voice
Router(config-if)# isdn incoming alerting add-PI
Router(config-if)# end
Router(config)# end
Router# show running interface BRI1/0
Building configuration...
