In OpenScape 4000 the caller ID number is sent via PRI NI2 from Telco central office to an analog port between the first and second ring cycle. The Calling Party Name Facility message is a separate message that is sent after the OpenScape 4000 (PBX or CPE) sends the Alert message to the Telco central office.

OpenScape 4000 only sends caller ID information during the long silent interval between the first and second power ringing patterns.

Telco sends caller party name information typically after silent interval between the first and second power ringing patterns.

Activating this feature the caller ID number and caller party name is sent between first and second power ringing pattern.