On Mon, Nov 14, 2016 at 07:59:16PM -0800, Alexander Chemeris wrote:
The reason why people use TCH/F is because it offers higher quality than TCH/H. E.g. if you're using AMR, you can go only up to 7.95 mode in TCH/H (see https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec). So just saying that TCH/H is "more efficient" is not correct. It's more efficient in exchange to some loss in quality.
IMHO twice the number of timeslots qualifies for saying "more efficiently using the available timeslots" :)
But thanks for this clarification. My impression so far was that AMR on TCH/H has fair enough quality that the voice call experience isn't noticeably different to TCH/F and "everyone is using it anyways"...?
Also how do "people use" TCH/F? Is it a choice the MS user is able to make? Or is this always a choice on the CN side?
~N