Posted: Wed May 20, 2009 6:11 pm Post subject: [asterisk-biz] GSM-Ethernet Gateway that supports GSM-Codec?
Hi,
this might sound pretty stupid, but i've tested some dozen from different vendors, and all of them just support g711.
Judging from the audio-quality, at least the cheaper ones are more-or-less a simple phone with an fxo-style interface that re-digitizes the audio, what i'm looking for is a device that transparently sends the gsm-encoded audio via rtp to asterisk.
anyone?
Download the new Windows Live Messenger! Looking for a fresh way to share photos?
Posted: Wed May 20, 2009 6:20 pm Post subject: [asterisk-biz] GSM-Ethernet Gateway that supports GSM-Codec?
Why do you want GSM?
Andreas Anderson wrote:
Quote:
Hi,
this might sound pretty stupid, but i've tested some dozen from
different vendors, and all of them just support g711.
Judging from the audio-quality, at least the cheaper ones are
more-or-less a simple phone with an fxo-style interface that
re-digitizes the audio, what i'm looking for is a device that
transparently sends the gsm-encoded audio via rtp to asterisk.
anyone?
------------------------------------------------------------------------
Download the new Windows Live Messenger! Looking for a fresh way to
share photos? <http://download.live.com>
Posted: Wed May 20, 2009 8:08 pm Post subject: [asterisk-biz] GSM-Ethernet Gateway that supports GSM-Codec?
On Wed, 2009-05-20 at 19:08 +0000, Andreas Anderson wrote:
Quote:
Hi,
this might sound pretty stupid, but i've tested some dozen from
different vendors, and all of them just support g711.
Judging from the audio-quality, at least the cheaper ones are
more-or-less a simple phone with an fxo-style interface that
re-digitizes the audio, what i'm looking for is a device that
transparently sends the gsm-encoded audio via rtp to asterisk.
there is a potential problem with this. GSM6.10 is all asterisk does,
there is the GSM-AMR (adaptive multirate, as opposed to the fixed rate
6.10 does) is patented and afaik there is no patent license or codec to
do the AMR parts. as a result if it just did passthrough it would have
to specifically not support AMR, and getting that info may be somewhat
difficult as marketing monkeys wouldnt understand what you are asking -
but it would be osmething to look for if you got one.
Posted: Wed May 20, 2009 8:11 pm Post subject: [asterisk-biz] GSM-Ethernet Gateway that supports GSM-Codec?
On Wed, 2009-05-20 at 15:16 -0400, Alex Balashov wrote:
Quote:
Why do you want GSM?
presumably because its a GSM gateway, and he wants the raw data from the
radio board so that the device itself doesnt transcode, and he can then
only transcode 1 time instead of potentially gsm->g.711->g.729 which
will cause some additional audio distortions vs gsm->g.729 (in both I
omitted the signed linear stages thinking its implied but someone
somewhere will say something if I dont mention it).
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
