I look at the new IP Phones and wonder: Are they morphing into a cell phone?

I like cordless handsets, mainly because I walk when I am talking. It helps me think and it sounds better for the caller. And I use a corded headset.

So when I look at the newest DECT phones like Aastra 600D series, Cisco WIP310, and others, they are so small, lightweight and are starting to resemble a cell phone. Right? A perfect example is the UniData Wi-Fi phones. These look just like a cell handset and come with video capabilities and cameras. No other handset has that yet.

Broadsoft extended Web 2.0 services to the mobile device. So has Mitel. Blackberry wants to mobilize your PBX - to make your cell phone an extension on the office PBX system. So does Mitel. So does Broadsoft. Oh, and so do the cell carriers because they want you to spend those minutes.

It looks like only difference between your IP phone and your cell phone will be signaling technology (Wi-Fi, CDMA, GSM, DECT). When we get a phone with half those chips in there, will the desktop phone become obsolete? Are we really that mobile? I sit at my desk at least 40 hours per week when I am in town. I can't see getting rid of my cell phone even with those home phone systems that jack into your cell phone. For me the call quality on the cell is inferior to either my VoIP line (most times) and my POTS line.

I think that battery life will always save the desktop phone. I wish it could do more: like updates and texts or IM or something. After all the desktop IP phone by Polycom or Aastra (the ones I am familiar with) are mini-computers. Broadsoft and Aastra have XML marketplaces for apps for them, but I have not heard (or seen) anyone taking advantage yet. (Anyone?)

As more minutes move away from the PSTN to VoIP Networks and Cellular systems, what happens to the PSTN? Where's the Tipping Point when the telcos can't or won't maintain it anymore?