You'd need to load the "adventerprisek9_ivs-mz" or "ipvoice_ivs-mz" feature set, per the above doc, for CUBE functionality. The IOS for 3725 is limited, latest is 12.4(15)T14. 12.4(24)T and 15X images are not available for this platform, so only basic CUBE features and supplementary services are available on the 3725...you wouldn't have access to the more recent/advanced CUBE features and supplementary services.
No licenses are needed, only the "voice service voip" configs such as:
voice service voip allow-connections h323 to h323 allow-connections h323 to sip allow-connections sip to h323 allow-connections sip to sip
This enables IP-IP GW/CUBE functionality.
No, PVDM's aren't needed, not unless you plan on configuring locally registered transcoding/MTP. But not needed for basic CUBE functionality.
The DRAM and flash requirements, as well as IOS feature sets are listed below:
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