Cisco CCNP Collaboration 300-810 Question # 51 Topic 6 Discussion

This option blocks calls to 9005551234 for any caller that reaches the Caller System Transfer conversation, which is one of the ways that Cisco Unity Connection can transfer calls outside. The default Transfer Restriction Table is associated with the default System Call Handler class of service, which is used by the Caller System Transfer conversation. Blocking 900 on this table prevents toll fraud by restricting calls to any number that starts with 900, which are usually premium-rate numbers. References:

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/connection/10x/security/guide/10xcucsecx/10xcucsec020.html

https://www.cisco.com/c/en/us/support/docs/unified-communications/unity-connection/119337-technote-cuc-00.html