Calling-party camp-on

In telecommunication, a calling-party camp-on is a service feature that enables the telephone exchange to complete an access attempt in spite of temporary unavailability of system transmission or switching facilities required to establish the requested access.

Systems that provide calling party camp-on monitor the system facilities until the necessary facilities become available, and then proceed to complete the requested access. Such systems may or may not issue a system blocking signal to inform the calling party of the access delay.