Usage:
Use this command to
enable or disable subscription to Notification of Signaling Transmission
Path Status, as well as IPCAN Change type notification.
When enabled, the P-CSCF/A-BG
sends AAR to the external PCRF via the Rx interface after UE registration.
When disabled, the P-CSCF/A-BG will not subscribe to any
event during Registration with PCRF and no diameter session will
be established.