Each channel of voice (running G711) would require one channel of DSP to run. So if you have a 2-port VIC2-2FXS for example, you would need 2 channels of DSP. You require more for advanced/compressed codecs.
As your E1 has 30 channels, you need 30 channels of DSP. So the smallest you can use is a PVDM2-32. It's supplied in the form of a small module (like a memory DIMM) which you install internally in the router.
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I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...