[Freeswitch-users] g729 passthrough mode

[Steven Ayre]

"I think Steven meant that no transcoding was required at the FS
level, which was the point of Abid's question."

Yes, to show it's specifically the lack of encoder/decoder that means
no license is required and that it's the raw data from the client
that's sent straight through in passthrough. Which isn't quite how it
works with other codecs where you can attach media bugs etc which you
can't do with a passthrough codec.


"And the main disadvantage of using bypass media is probably the NAT
handling, and the lack of topology hiding."

Plus in a lot of cases firewalls may not allow it.

Example 1:
We have customers -> FS -> gateways. Gateways are reachable by FS but
not from customers (due to IP ACL on gateway firewalls).

Example 2:
We have also have customers -> FS -> gateways. Gateways are on LAN, so
reachable from FS but not from customers.

In both those cases bypass media wouldn't work, since there's no way
for traffic to go between the gateways, but FS can't know that so the
call would be setup but with no audio.

-Steve




On 3 October 2010 21:06, David Ponzone <david.ponzone at ipeva.fr> wrote:
> Mazilo,
> I think Steven meant that no transcoding was required at the FS level, which
> was the point of Abid's question.
> And the main disadvantage of using bypass media is probably the NAT
> handling, and the lack of topology hiding.
> David Ponzone  Direction Technique
> email: david.ponzone at ipeva.fr
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> Le 03/10/2010 à 16:34, mazilo a écrit :
>
>
> Steven Ayre wrote:
>
> If G729 is at both ends, then no encoding/decoding is required as the
>
> raw data can be sent straight through. This is passthrough mode.
>
> Because there is no encoding/decoding stage, there is no licence
>
> required in this case.
>
> A more appropriate way to say this is no transcoding. Encoding/decoding
> processes are still done at each endpoints on the device, i.e IP Phone, ATA,
> and/or computer (with softphone), and a G729 license is still required when
> the call uses the G729 CoDec (which is mostly paid when one acquired the
> device with a built-in G729 CoDec). So, to say no encoding/deconding
> involved and no license required are really misleading and definitely
> incorrect.
>
> BTW, one can also configure his/her FS system with bypass media option to
> ensure the FS only does the SIP with no media handling. The advantage using
> this approach is to leave FS alone and free up some of its networking
> resounrces to handle the media during a call. There is also some
> disadvantages, i.e. no MOH, etc.
>
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