After getting reports that users cannot make calls out to the PSTN, a network administrator opens the Cisco Unified Communications Manager Administration web page and begins to review route patterns. Why would the administrator look here when troubleshooting PSTN connectivity troubles?
A. A route pattern contains a list of gateways that can reach the PSTN.
B. A route pattern contains dial plan information for calling the PSTN.
C. A route pattern contains the necessary privileges for calling the PSTN.
D. A route pattern contains a list of SIP trunks that can reach the PSTN.
