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HDVoice: On The Cheap & Analog RJ-11 Style

HDVoice RJ-11 Wall Plate A short while back I addressed the question of how DECT & CAT-iq may foster the broad deployment of HDVoice. At that time I described one possible scenario where carriers would deploy customer premises equipment (CPE) with an on-board cordless base station. Although a frontrunner, and the basis of Comcast’s (decidedly non-HD) HomePoint service, this is not the only approach afoot. There’s another possibility arising that involves conveying HDVoice over a plain old analog RJ-11 connection.

At first glance HDVoice and analog lines would certainly seem to be mutually exclusive. The common wisdom is that wideband telephony requires the use of an all-IP call path. This is in fact a generalization, and not absolutely true.

Firstly, it has long been possible to pass wideband audio, in the form of G.722 encoded media, over the PSTN by way of ISDN connections. Also known as BRI interfaces, an ISDN connection supports  up to two 64 kbps channels (bearer channels) and one D channel for the purposes of call setup & teardown signaling. High-quality voice using G.722 was one of the selling points of ISDN in the 1980s.

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The Gigaset C610A: Dialing By SIP URI

We’ve had the Gigaset C610A in the house for quite some time. It’s long been on my list of devices for review. However, it’s difficult to find the time to commit to such tasks when the current model of Gigaset is so much like one of the prior models. There’s just no getting around the fact that the C61H handset is very like the C59H, which we’ve had for over two years.

That said, the C610A does offer a few niceties that were suggested to the company when they launched the line in the US back in 2009. Earlier today a new thread in the DSL Reports VoIP Forum prompted me to take just a little time to explore dialing by SIP URI on the C61H handset.

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