I think that another option for this requirement is send the call to the loopback interface and receive de call with "voice translation rule - Reject" obviously with some translations of digits.
Phones: DN-3001, DN-3002 voice translation-rule 10 rule 1 reject /3002/ voice translation-profile Block-911 translate calling 10 dial-peer voice 911 voip destination-pattern 911 session target ipv4:10.10.10.1 (Loopback Interface) dtmf-relay h245-alphanumeric tech-prefix 1# no vad dial-peer voice 9112 voip call-block translation-profile incoming Block-911 incoming called-number 1#911 dtmf-relay h245-alphanumeric no vad dial-peer voice 9113 pots destination-pattern 1#911 forward-digits 3 port 0/2/0:15 Maybe is a large configuration but functional. Greetings
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