I bought the SPA9000/SPA400 and 10 SPA504/SPA525 phone sets, for use with 4 analog PSTN lines, thinking this could be easily setup. Here's a list of problems that I'm having, and the only response from multiple calls to tech support is basically: Oh Well.
1. This only way to configure an extension for voice mail is through the Wizard. The SPA9000 admin manual describes exactly how to do with the web interface to the SPA9000 and SPA400, but this simply does not work. (Any customizations to, say, dial plans, will be wiped out by using the wizard) You basically need to know at your initial setup exactly which extensions will always have voice mailboxes. Even a hard reset of the SPA9000 and SPA400 will never be able to remove these extensions - the firmware can never delete these from its flash memory. And adding mailboxes later with remove customizations.
2. When I have three extensions on one Shared Line Appearance, I see strange behavior. This is confirmed by another recent posting on this forum. The SPA9000 admin manual clearly states an SLA can have multiple extensions, but apparently 2 is the max. This is not good.
3. I can't get external access to the voice mail system - I always get a fast busy.
4. Cisco customer support's standard answer is mostly, Use the Wizard for everything, or Reset the Box. Unfortunately the wizard does not covers much.
And yes, all firmware is up to date.