What version of IOS are you running? There is a redirect bug in some of the older IOS. Extension to extension was not effected, but Trunk to Extension was effected.
Try this and I think it may help. Create a dialpeer that matches the number called to get voicemail. In this dialpeer make sure you do a "forward all extra inband". This will forward DTMF inband. One of the problems you will have is stripping the 9 off the outbound call. You need to create a translation rule that strips the 9. It should look like this:
I am not sure there is bug at the router, coz the tac told me that the dtmf tone get inside the unity (he use "call viewer" and "port status monitor"). I can see "#" and the extension was entered into Unity.
Now, they tried to figure out how to make the opening greeting to accept those dtmf tone.
I got debug voice ccapi inout at router:
dest=91646xxx8280#1002 --->1001 call 1002
cisco-rdn=1002 --> forward number
Well, I am all ears... hopefully someone done this kind of intergration before... please let me know..
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