[Freeswitch-users] codec

[Steven Ayre]

Transcodable codecs allow you to convert between different codecs, for
example on different call legs or when recording etc. Most codecs are this
type.

Some codecs though are patented and need to be licensed to use, eg
G729/G723.1/AMR. To at least have some support for these they're
implemented as passthrough codecs - you can pass the raw data from phone to
another on a bridge without needing a codec because you're not doing the
encoding/decoding. However this means you have a limitation that you cannot
use these codecs for anything that needs that ability -
voicemail/conference/record/eavesdrop etc, and bridging with different
codecs on each leg.

If you want to use G729 that's one case where there is both a passthrough
and commercial transcoding codec. mod_g729 is the passthrough one.
mod_com_g729 is transcodable, but requires purchasing licenses from
www.freeswitch.org.

-Steve


On 28 February 2013 18:53, Venkateshwaran Thirugnanam <
venkateshwaran54 at gmail.com> wrote:

> Hi All,
>    What the difference between Transcodable codecs and Pass-Through Codec?
> Pls explain
>
> Thanks,
> Kumaran T
>
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