An engineer must configure open SIP Federation on cisco IM and presence using cisco Expressways with the additional requirement not to allow a specific list if domains and allow all other domains that are not specified.
How is this additional requirement met?
A . Configure default static routes for each blocked domain with an invalid next-hop IP address.
B. Add a static route for each blocked domain and keep the “Block Route” checkbox checked.
C. Block the specified SIP domains on the Expressway
D. Add each allowed domain as a SIP Federated domain.
Answer: C
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