This s what the knowledgebase tells me:
Here is a list of the named .wav files used by Voicemail Pro for US and UK English. These are predominately, though not exclusively, used for IP Office mode mailbox features and Voicemail Pro custom call flow actions.
All files are Microsoft WAVE file format (.wav) 8kHz, 16 bit mono.
ACS - Implement IP Office
ACA - Implement IP Telephony -- ACA - Design IP Telephony
ACA - Voice Services Management
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Women and cats can do as they please and men and dogs should relax and get used to the idea!