[asterisk-users] Call recording format

[Joel Maslak]

WAV or wav?  One of these has GSM-encoding inside a WAV formatted
envelope.  That said, I wouldn't expect that to have any noticeable
CPU utilization above that of GSM.  If you are using the non-GSM
version of WAV, then I am as baffled as you - hopefully someone who
knows more about this can help.

On Mon, Nov 22, 2010 at 7:58 AM, Vilius Adamkavicius
<vilius.adamkavicius at invade.net> wrote:
> Hi Joel,
> We have a meetme on which we are landing two G.711 alaw calls, one coming
> from TDM another from SIP. Once we those parties are in the conference we
> are adding one more leg using Local channel and starting to record it.
> Surely it would be logical if it would be less overhead recording alaw wav
> since we are using alaw on both parties, but its not.
> Thanks,
> Vilius.
> On 22 November 2010 14:19, Joel Maslak <jmaslak at antelope.net> wrote:
>>
>> What format are the actual calls in?  Are they in G.711u/a format or
>> are they in something else (perhaps gsm?) format?  I'm asking to find
>> out if Asterisk would need to transcode them.
>>
>> On Mon, Nov 22, 2010 at 6:47 AM, Vilius Adamkavicius
>> <vilius.adamkavicius at invade.net> wrote:
>> > Hi All,
>> > We have a requirement to record over 60 simultaneous calls. Our
>> > recording
>> > facilities are implemented using Monitor() over AMI. The thing we have
>> > noticed that making 60 simultaneous call recordings using wav CPU load
>> > is
>> > significantly higher (around 2 times more) than using gsm. Even writing
>> > call
>> > recordings to /dev/null makes a big difference in CPU load.
>> > What could be the reason for this? Is Asterisk updating wav headers
>> > every
>> > time it writes?
>> > What would be recommended hardware setup for over 60 simultaneous call
>> > records?
>> > Regards,
>> > Vilius.
>> >
>> >
>> >
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>
>
> --
> Vilius Adamkavicius
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