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which three commands must be configured in the MGCP fallback router?

To preserve analog calls in an MGCP switchback event, which three commands must be configured
in the MGCP fallback router? (Choose three.)

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A.
h323

B.
mgcp-switchback-graceful

C.
voice service voip

D.
mgcp-graceful

E.
preserve-h323

F.
no h225 timeout keepalive

Explanation:
these additional command for call preservation when using MGCP fallback:
voice service voip
h323
no h225 timeout keepalive
ReferencE. CCNP Voice CIPT2 642-457 Quick Reference, 2nd Edition


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