[Freeswitch-users] To Proxy Media or Not

[Max Clark]

So this is an interesting side effect of removing proxy_media=true
from the dialplan:

2011-03-09 19:17:31.055236 [ERR] mod_g729.c:145 This codec is only
usable in passthrough mode!
2011-03-09 19:17:31.055236 [ERR] switch_core_io.c:897 Codec G.729 decoder error!

Am I reading this correctly that FreeSWITCH attempted to transcode a
G.729 audio stream?

On Wed, Mar 9, 2011 at 11:07 AM, Kristian Kielhofner <kris at kriskinc.com> wrote:
> Fax over g711 (if it's going to work at all) should not be affected by
> proxy media or default media handling as long as you allow PCMU/PCMA
> when using the default media handling.  However, T38 and fax over 711
> are completely different.  Using T38 through FreeSWITCH with the
> default media handling will require some extra configuration (nothing
> drastic).
>
> No one said anything about transcoding...  Proxy media mode does not
> have the ability to transcode at all as FreeSWITCH is completely
> unaware what codec you are using (internally it actually reports
> "proxy" as the codec).
>
> Just because you're using default media mode DOES NOT mean you will be
> transcoding.  Using some Sofia params and late-negotiation dialplan
> logic you can have an incredible amount of control over what codecs
> your end points are using.  As long as they agree on at least one
> codec and codec parameters you are the one who decides which codecs
> take precedence and whether or not you'll be transcoding.
>
> On Wed, Mar 9, 2011 at 12:13 PM, Max Clark <max.clark at gmail.com> wrote:
>> Advantages of Proxy Media:
>>
>> 1) Support codecs not natively supported by FreeSWITCH
>> 2) Lower CPU resources on FreeSWITCH
>>
>> So for 1) I'm really only concerned with t38/fax over g711. With our
>> current configuration faxing (although unsupported) is working just
>> fine. What should I expect if I revert to media mode?
>>
>> 2) If I disable transcoding, what kind of difference in resource
>> utilization should I expect? Nominal (less than 10%), Moderate
>> (11-30%), or more?
>>
>> Thanks,
>> Max
>>
>
> --
> Kristian Kielhofner
>