It’s been a while since I spent any amount of time thinking about the endpoint world but some recent developments around mobile SIP clients and softphones have my attention once again. The question is, “Are we ready for a 3G softphone?”

With 3G comes plenty of bandwidth and powerful mobile devices. The likelihood that carriers will want to cannibalize their own revenue in order to deliver VoIP on the cheap and/or free is… low, to say the least. With that being said there are rumblings that this is in fact what they are planning.

We all know that Rogers is bringing the iPhone to Canada on a 3G network. The fact that there is now an SDK for iPhone will make it rather easy to create a SIP client for the iPhone. On its own, the iPhone does not have enough of a subscriber base to drive mass adoption of a mobile SIP softphone, but it will certainly help.

I know the boys at Counterpath (Congratulations Donovan!) have been busy with FMC and it would seem as though they would be the carrier’s choice for any mobile 3G SIP softphone solution. Although, It’s not clear if a mobile SIP SDK is just a component within their enterprise offering?

So, what other 3G mobile SIP softphone solutions are there out there and which would qualify as a valid choice for a carrier?

If we search for “mobile sip” we see Nokia leading the charge. Not surprising, Nokia has been the predominant player in embedded SIP clients for years now. They have a bit of a leg up there, owning the device doesn’t hurt, or does it? From a carrier’s perspective one would think that getting further into bed with the device vendor could be troublesome but I guess it could work the other way as well.

Something else that’s interesting is that Google’s Android does not have a SIP stack. Not surprising when you think of it. After all Google Talk is still very limited in it’s telephony abilities. One would expect that with the introduction of Android, this would change.

Truphone would likely be a good choice but they are not a softphone vendor, they are a service provider, plus they currently only support Nokia devices. Although I know they have a version working on iPhone already and it would not surprise me if they were working on something for RIM devices.

So who’s left?