Refer to the exhibit.

When the user of a phone registered to the Cisco Unified Communications Manager places a call to
3001 when the SAF network is down, what happens?

A.
The call fails.

B.
The call is rerouted to the PSTN with the constructed PSTN number as +442288223001

C.
The call is rerouted to the PSTN with the constructed PSTN number as 442288223001

D.
The call is rerouted to the PSTN with the constructed PSTN number as 0002288223001

E.
The call is rerouted to the PSTN with the constructed PSTN number as +0002288223001

Explanation:
When the SAF forwarder loses network connection with its call-control entity, the SAF forwarder
withdraws those learned patterns that were published by the call control entity. In this case, CCD
requesting service marks those learned patterns as unreachable via IP, and the calls gets routed
through the PSTN gateway.
Link:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmfeat/fscallcontroldisco
very.html