Interesting. First few results I saw included a picture and a video of someone's 3100D which had VOIP ports, as well as an ISP's CG3100D manual which was just the 3100 manual.
Nonetheless as I mentioned above it's the same BCM3380 chipset and does have telephony support:
Quote:
Advanced VoIP Subsystem
• 2-line Audio Processing Module with integrated codec and HVG
• Direct interface to low-cost external dual SLIC
• PCM interface for expansion beyond two voice lines
• Battery Management Unit
• CablexChangeŽ software support
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http://datasheet.elcodis.com/pdf/48/...3380dkfsbg.pdf