[Freeswitch-users] record_session sound quality

[Sune Kristensen]

Ok, I think it is the PCMA codec in some way.
I have just made some test calls through our Danish phone provider (musimi.dk) and when I call out PCMU is used and the quality is fine. When I call in from my mobile PCMA is used and the quality is bad (Only the recording).
If a transfer is made where PCMU is used for the new call (Call then transfer), the recording is fine, from the point where it is put on hold, this suggests that something happens either because of the hold/moh or because of the PCMU call.

And it looks like I can reproduce it every time.

/Sune

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Sune Kristensen
Sent: 4. september 2008 16:20
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] record_session sound quality

Have been looking at it a bit more, and it looks like the internal calls are all PCMU, so when the call is put on hold, and a new call is made before transfer, the new call will be PCMU. If the call is not transferred (As is the case with the sample I sent to Brian), I would expect it to go back to PCMA, and as far as I can tell it does, but the recording quality is still good, so don't think it is the codec in itself, but maybe something don't get initialized correctly until PCMU is used!?

Will do some more testing with this is mind!

/Sune

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Sune Kristensen
Sent: 4. september 2008 15:18
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] record_session sound quality

The file I sent to Brian had PCMA 8000 on each leg, and it seems to happen every time when the UK number is called and the UK client answers. We don't get that many calls like that, so don't have that much data yet.
The weird thing is that the beginning of the call can be really bad, and then after a hold or transfer, it is fine.

/Sune

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: 4. september 2008 14:41
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] record_session sound quality

what codec is each leg of the call using?
can you pinpoint an exact scenario where it happens every time?
On Thu, Sep 4, 2008 at 4:38 AM, Sune Kristensen <shk at visanti.com<mailto:shk at visanti.com>> wrote:

Hi



I am having some problems with the quality of the recordings, but only for some calls.



The FreeSWITCH server is running in Denmark and we have a phone provider in the UK (voipfone.co.uk<http://voipfone.co.uk>). We have 2 external client connecting through OpenVPN, one in the UK and one in France.

If I call the UK number and the UK client answers it, the quality of the call is fine, but the recording is very bad quality, almost impossible to hear what is being said. If that call is then transferred to the client in France (Or to one of the internal clients in Denmark), the quality is good again from that point forward in the same recording.

I would think that the quality of the recording would be the same quality as the call itself, but that does not seem to be the case.

Anyone has an idea about what can cause this and how to solve it?



/Sune

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Anthony Minessale II

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