Try putting in a wait after you answer.  It's possible the message is  
playing before the RTP is setup.  I would change your dialplan to be

exten => 333,1,Answer()
exten => 333,n,Wait(1)
exten => 333,n,Playback(vm-goodbye)
exten => 333,n,Hangup()

HTH,

James

On Mar 17, 2008, at 5:47 AM, Anselm Martin Hoffmeister wrote:

> Am Montag, den 17.03.2008, 15:08 +0800 schrieb Pete Kay:
>> Hi,
>> I am new to Asterisk and I am having a setup problem that I am trying
>> to resolved for the last couple days without any success.  I am  
>> pretty
>> much desperated on this issue and I don't know why.  Can someone
>> please kindly help me to troubleshoot this?  I can't hear any audio
>> from Asterisk when running Playback or VoiceMail tests.
>
> Dear Pete,
>
> my first idea would be that something with your codecs is borken  
> (TM). I
> personally use a setup quite similar to yours, with the one visible
> difference that I also allow the "gsm" codec, owing to the fact that  
> at
> least my home-recorded prompts are gsm only. I _guess_ asterisk  
> could or
> should handle format conversion from audio files automagically, but  
> for
> making sure, please try adding "gsm", at least for now.
>
> You might also want to setup the
> [sipclient] stanza in sip.conf such that "nat" is set to "no",  
> although
> I do not see why that should break things. Especially as "Echo" works.
>
> The externip is set to your current external IP, right? (Knowing full
> well that some DSL lines get a new IP as often as 6 times a day, or  
> as a
> P2P bandwidth countermeasure down to five minute intervals at certain
> restrictive providers once your "fair use" volume is used up). Again
> this should not be the culprit...
>
> Poking with a stick in the swamps, but perhaps hitting the bug :-P
>
> BR
> Anselm
>
>
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