Kristian Kielhofner wrote:
Jean-Michel Hiver wrote:
I was wondering what could be pros and cons of ztdummy vs proper timer device (i.e. X100P).
I am going to set up an asterisk server in europe (to do trunking, to save bandwith) and I was wondering if it'll be OK to get it going with ztdummy.
Furthermore, I have only a 1024/256kbps PPPOE DSL link and I need to squeeze 12 channels through, I was wondering which codec would be suitable for this? Is g.729a going to be indispensable or can I get away with something like GSM?
Cheers, Jean-Michel.
Jean-Michel,
Ztdummy can be okay, but true hardware timing WILL be better. But, as Rich pointed out, that 256kbps ADSL is probably going to hurt:
256 - 41 = 215kbps usable bandwidth (%16 PPPoE overhead)
IAX2 trunking with g729: 40kbps
each add. call: - 10kbps
So, 215 - 40 - 110 = 65kbps
You only have about 65kbps to spare, and all of this is based on ideal (theoritical) conditions. I doubt that those 12 calls will sound okay, or even work at all...
But, you can always try!
You might do better with Speex ABR at 8kbps or 10kbps average bitrate; (or, speex vbr) At least with speex you have the knobs to turn to tune things a bit better..
(which led me to find a bug in the ABR settings for speex in * CVS..).
-SteveK
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