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uk.telecom.voip (UK VOIP) (uk.telecom.voip) Discussion of topics relevant to packet based voice technologies including Voice over IP (VoIP), Fax over IP (FoIP), Voice over Frame Relay (VoFR), Voice over Broadband (VoB) and Voice on the Net (VoN) as well as service providers, hardware and software for use with these technologies. Advertising is not allowed.

Which codec corresponds to GSM?

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Old July 14th 05, 09:18 AM posted to uk.telecom.voip
Henry F III
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Posts: 5
Default Which codec corresponds to GSM?

GSM is different from all the codecs you mention.

If a codec has another 'number', it is a different standard.

GSM is 13300 bits/sec (without the RTP + ethernet overhead)

Generally: 1 codec on 1 end can ONLY talk to the same codec on the other

So if your ATA has no GSM codec, you can not talk to a SoftPhone that has
GSM codec.

Solution: use an ATA with the GSM codec (or an IP phone with the GSM
Please check out http://www.xeloq.com -- I am a customer there for 1,5
year and I have an IP phone + ATA 1 port that has GSM codec....and I use
SJPhone + Xlite as well......

They are changing websites - I see the new ATA with GSM codec that I have
here not on the site yet. Ask them.
The Katana-IP300 has GSM codec (and all the other codecs) - EUR 89,-

The ATA with GSM codec is EUR 79,-(that is what I paid for it).


PS: Here is a nice VoIP calculator:

"Al" wrote in message
My new ATA allows a number of codecs as follows:
G711u, G711a, G726-16, G726-24, G726-32, G726-40, G729a, G723

Is there a resource somewhere that describes these and the bandwidth
required by each? In particular, for my softphone I've used GSM
successfully. Which one of the above codecs corresponds to GSM?


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