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In a Cisco Unified Communications Manager design where +E.164 destinations are populated in directory entries, which call routing practice is critical to prevent unnecessary toll charges caused by internal calls routed through the PSTN?
Correct Answer: A
Explanation/Reference: Reference:https://supportforums.cisco.com/discussion/11874706/forcing-net-calls-pstn-failover Or http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab09/clb09/dialplan.html