I have CUCM 6.1.2 and mgcp gateways with ISDN PRI links. When a CallManager ip phone dialed a unallocated DN#, the annunciator will play the following prompt to the calling ip phone: "Your call cannot be completed as dialed. Please consult your directory and call again or ask your operator for assistance. This is a recording."
Can I make the annunciator to play the similar prompt when the calling party is external PSTN?