An engineer has configured a comprehensive dial plan for a remote site with SRST on Cisco Unified Communications Manager. While simulating an outage for the site, the engineer discovers that a SRST phone cannot dial a long distance number. Which configuration component must be accessed to troubleshoot this issue?
A. telephone registration configuration on SRST gateway
B. route patterns on Cisco Unified CM
C. dial peers on SRST gateway
D. SRST configuration in Cisco Unified CM
