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Re: [Linphone-users] Latency with Bluetooth headset

From: Simon Morlat
Subject: Re: [Linphone-users] Latency with Bluetooth headset
Date: Wed, 30 Nov 2005 22:30:19 +0100
User-agent: KMail/1.8.2


Try setting the jitter compensation value to 40 ms instead of 60 ms (the 
default value). It's in the configuration window, network tab.
Tell me if it improves the situation.


Le Jeudi 24 Novembre 2005 09:51, Sybren Stuvel a écrit :
> Hi all,
> I'm having a latency of 2 to 3 seconds using Linphone 1.1.0. To test
> this, I've set up an Asterisk server on my LAN, running an echo test.
> My setup is as follows: I'm using a bluetooth (BT) headset (Bluespoon
> AX) connected to a BT USB stick. It's presented to the system as an
> extra sound card, using bluetooth-alsa. It works with both ALSA and
> OSS.
> Every time a program is using this "sound card", my computer
> reconnects to the BT headset, and as soon as sound is no longer used,
> it disconnects again. Creating this connection takes a few seconds,
> and I think that this is the source of the delay. If I replace the
> audio-out with a regular headphone, the delay is cut in half. If I use
> a regular microphone as well, the delay is reduced to half a second.
> Still, this delay of half a second is about 0.2 seconds longer than
> the delay that KPhone gives me. Ordinarily, I'd say "just use KPhone
> then", but the problem with KPhone is that it doesn't support RFC2833
> DTMF - just inband. Inband DTMF only works with alaw and ulaw, but I
> want to use the GSM codec, so KPhone isn't really an option.
> Sybren

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