After configuring a Cisco CallManager Express with Cisco Unity Express, inbound calls from the PSTN SIP trunk receive a ring tone for 20 seconds and then a busy signal instead of voicemail. Which configuration fixes this problem?
A.
Router(config)# voice service voip
Router(conf-voi-serv)#allow-connections h323 to h323
B.
Router(config)#dial-peer voice 2 voip
Router(config-dial-peer)#no vad
C.
Router(config)# voice service voip
Router(conf-voi-serv)#allow-connections voice-mail mod
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