Which two options are dial-plan challenges in a multisite Cisco Unified Communication Manager deployment?

Which two options are dial-plan challenges in a multisite Cisco Unified Communication Manager deployment?
A. use of same length directory numbers all over the network
B. use of +E164 directory numbers and extensions for phones and services
C. telephony service provider requirements on number format and types
D. use of MGCP gateways instead of SIP trunks
E. use of same DID numbers in multiple sites

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3 thoughts on “Which two options are dial-plan challenges in a multisite Cisco Unified Communication Manager deployment?

  1. I agree with C and E.
    Why would SAME length DN’s complicate or be a challenge?
    If anything that makes it easier to plan for and configure.
    Variable Length Numbering is more of a challenge.

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