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I have been using VoIP for my landline for years, with an analog telephone connected to internet via an ATA.
Recently, this Grandstream GXV3175 PoE video phone sparked my interest in upgrading and getting rid of the analog phone and ATA, but now I wish to upgrade to an Android system with camera and market. It could then also serve as a simple always-on portable PC for quick lookups or web browsing, and basic organiser/games/multimedia…

There already are several ideas for using Android systems as a desktop phone:
  - Android desk phones with Power-over-Ethernet
  - Android desk phone tablet+dock, for landlines with xDSL

Budget/specs-wise I like the Archos 80 G9 tablet. And ideally, there would be a Telpad-like dock but with PoE, but since that is not available for the moment, I was thinking about just connecting an external handset to the tablet in order to have proper microphone quality. Here I see 2 possibilities:
  1. via an USB port, e.g. Tiptel or Digitus
  2. via an earphone port, e.g. iPego or Moshi Moshi

However, if I read up correctly, none of the above seems to be supported on Android tablets?!
  - Does the OS (3.x/4?) actually support the USB handsets or are there drivers readily available?
  - Are there Android tablets that have a 4-band or 4-pole earphone port with support for an external headset/handset with microphone? (Above-mentioned iPego or Moshi Moshi handsets are for iPhone/iPad only…)

How can I do this? Any suggestions/alternatives?

PS: sorry, new users can only post a maximum of two hyperlinks :/

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For external headsets you would be better looking at the incredible range of bluetooth enabled headsets for mobiles. I doubt that there will be any support for the current desktop usb based ones anytime soon as its not the focus of Android atm. A hardware vendor would have to write the drivers for them, or an opensource effort.

I was just playing with the new native sip voip on Android 4 and its now deeply integrated. I was using the voip account that my home phone uses so my when someone call my house my mobile also rings and uses the wifi, very cool I wonder if this will pick off.

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Indeed, I expect no problems with the voip/sip part (in fact, my Android 2.3 mobile can also ring with my current home phone, given the same account settings and internet) but I just want to connect and use a wired telephone horn with the tablet… In fact, I wish to be able to turn all radios off when it is in use as a desktop voip phone, even if that means using e.g. a USB adapter for Ethernet (available) but now I'm diverging :] –  mousio1119973 Dec 29 '11 at 23:53
    
My Android mobile came with a wired headset with microphone, to plug into the earphone port. I would expect the same to be possible with Android tablets with an earphone port but they seem to lack the microphone support there – note: found the TRRS term now (tip ring ring sleeve). –  mousio1119973 Dec 30 '11 at 0:30
    
Ah ok I don't see why no radios is more intuitive :) I did not know about the TRRS term specifically either, the problem again is that tablets are not designed to be phones and that looks like a spec designed for phones and may be skipped when designing tablets. –  imp Dec 30 '11 at 0:53
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