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[Thanks, Ricky B.]
sip posts

It's still a shockingly open question exactly how the world's carriers plan on transporting voice over LTE -- which is something everyone who loves 4G should be freaking out about, considering that it threatens launch schedules and interoperability among unlocked handsets. A vibrant array of possible solutions are currently on the table, including everything from SIP-based IMS (which is already approved by the 3GPP, helpfully) to the controversial thought of leaving legacy GSM and UMTS networks live for the sole purpose of running voice. T-Mobile International is putting its bets on VoLGA -- Voice Over LTE via Generic Access -- by participating in the VoLGA Forum, which has just published the second version of its specifications and aims for 3GPP consideration later this year. The technology routes circuit-switched (that is, old-school) voice over data packets, but the problem is that there are a bunch of companies proposing the same thing in slightly different ways; Nokia Siemens Networks, for example, is working on its own proprietary standard that'll go head-to-head with VoLGA. Currently, T-Mobile's the only major network actively participating in VoLGA's development, though it apparently has the support of every major infrastructure vendor except Nokia Siemens. Whether it's VoLGA or something else, let's hope everyone gets on the same page on the double before everyone gets too entrenched in incompatible technologies that make roaming difficult and handset variety lame.
For Nokia, WiFi and VoIP have seemingly gone hand-in-hand for as long as 802.11 radios have been offered in S60 handsets. It makes sense, of course -- the internet is a great way to yap at little or no expense compared to plain old cellular voice minutes when a traditional WiFi hotspot is available, and Nokia was really ahead of the curve with jumping on the bandwagon and making sure that the capability has been available out of the box. Unfortunately, it looks like constant carrier pressure may have finally gotten the better of Espoo, with GigaOM confirming that 3rd Edition Feature Pack 2 doesn't contain a SIP stack built-in the same way that FP1 historically has. That doesn't mean VoIP products are totally locked out, but it does mean that apps that rely on the native stack are out of luck until they've implemented a new stack of their own. Products like the N78 and N96 are affected by the buffoonery, while the E71, which uses FP1, is not -- a good thing, considering the corporate affinity for VoIP and the Eseries' business leanings.
Carriers like to throw around the term "unlimited mobile-to-mobile" from time to time, but we don't think this is exactly what they had in mind. ROK's "Viper" VoIP client uses a handset's Bluetooth link to hook it up to a PC sporting a broadband Internet connection, which in turn connects it to any other handset with Viper installed. Better yet, Viper contacts are shown with their availability in a buddy list format -- but the best part? It's all completely free and covers platforms Skype doesn't. Compatibility is limited to a handful of Nokia handsets running S60 right now, but word on the street has ROK releasing on Java and Windows Mobile clients before too long.
It appears that another carrier has decided to give VoIP its warm, loving embrace. Nokia will be supplying Singapore's SingTel with its E60, E61, and N80 Internet Edition handsets, all of which support both GSM and WiFi; add some SIP-compliant VoIP into the mix, and you have yourself a nice little dual-mode solution. SingTel hasn't announced pricing, but plans on offering a flat-rate service enabling its customers to hop on the VoIP bit from any hotspot, including SingTel's own Wireless Surf Zones. There's no mention of handoff capability between networks, but if the price is right, we'll let it slide -- just don't go wandering off while you're hitting up the WiFi.
Cingular's announced that it plans to launch a new service "within the next year" that'll let users share videos while talking on their cellphone, something that you may remember was being tested earlier this year. Assuming Cingular hasn't gone on a completely different route, the service will make use of what's known as the IP Multimedia Subsystem (or IMS), which is a UMTS implementation of (SIP). It's nifty to be sure, but we're guessing Cingular will have to make the service really affordable for most people to be able to justify adding yet another expense to their monthly bill.







