This is exactly the same problem I have
Hi,
I posted a similar problem concerning my Siemens C450IP in another thread, and the symptoms seem to match exactly what has been described here.
Once again, my DTMF settings seem to work with any voice prompt system, EXCEPT Voxalot voicemail prompts.
So far, I haven't been able to solve this, and continue accessing my voicemail through a Sipbroker PSTN access number.
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