asterisk users - Dec 2004 - SPA-3000 - Stop Message Waiting Indication

Hi,

I have my Sipura SPA-3000 setup with Asterisk as follows:

[spa3k_line1]
  type=friend
  context=home
  secret=PASSWORD
  host=dynamic
  dtmfmode=rfc2833
  dissallow=all
  allow=ulaw

When an incoming call comes in, I have a Zap interface in Asterisk which
just does a Wait,15 then answers with voicemail.

The SPA-3000 detects the PSTN call and makes Line 1 ring - so I can
answer the phone if i'm around - if not, Asterisk gets to the end of the
15 seconds and answers the call.

However - I have a strange problem - after a person leaves a voicemail
message, I get a stuttered dial tone on the phone attached to Line 1 of
the SPA-3000 and it does 1 ring every now and again. How can it be doing
this if I dont have a mailbox= line in the asterisk config?

Any ideas how to stop the SPA-3000 detecting a message is waiting?

For now, I think i've got rid of it by disabling MWI and VMWI on the
SPA-3000 config but it would be nice to do it in Asterisk so my spa3k
config is as generic as possible.


Thanks

--ian