Summary:ASTERISK-11105: Big Latency of about 1-2 Secs.
Reporter:John Lassen (proteus74)Labels:
Date Opened:2007-12-22 17:20:57.000-0600Date Closed:2008-01-08 06:39:51.000-0600
Versions:Frequency of
Description:I've installed chan_mobile an it works very well.
But on an established connection, the called partner has a latency of about 1-2 seconds. The other hears the voice just in time.
Tested it on five different USB-BT-Sticks, everytime the same problem.
Maybe an SCO issue ?


Debian 4.0
Kernel 2.6.20
Mobile Phones : Sony K610i, Nokia N95, Nokia E60
USB-BT : DLink, Sitecom, aQuip, AVM Bluefritz, NoName (Whitelabel)
Comments:By: Dave Bowerman (dbowerman) 2007-12-22 23:45:55.000-0600

Just to clarify,

The call is outbound thru the mobile phone?

which party has the delay? the caller, or the called party?


By: Dave Bowerman (dbowerman) 2007-12-23 01:52:27.000-0600

could you test with latest svn?

Ive tested with SIP phone -> chan_mobile -> Nokia 6120c -> mobile network -> imate Jasjam

cant detect a delay.

By: John Lassen (proteus74) 2007-12-23 05:41:42.000-0600

Now i've installed the latest Trunk of Asterisk with Chan_Mobile .r499, but nothing has changed.
It seem's it is the same problem as in Issue 11164 discribed.

Here a litte scheme :

SIP(1) -> Asterisk -> chan_mobile -> Sony K610i -> PSTN(2)

When I(1) speak, the other side (PSTN) hears me just in time.
When PSTN(2) speaks, it takes about 1-2 secs, to hear them.

The same problem existes when you take the other way like, so PSTN called the Mobilephone :

PTSN -> Sony K610 -> chan_mobile -> Asterisk -> Sip-Phone

That it has the same effect.

Could you tell me which BT-Adaptor (brand,chip) you use ?

PS:Sorry for my worse english

By: Dave Bowerman (dbowerman) 2007-12-23 05:49:48.000-0600

I use a 'no-name' brand adapter which is based on the CSR chipset.

I also recommend using the latest bluez-libs and bluez-utils from www.bluez.org. There are a lot of bug fixes/improvements to audio in the latest releases compared to the libbluetooth that ships with most distros.

By: John Lassen (proteus74) 2007-12-25 06:32:59.000-0600

Now i've installed the latest Bluez-Libs (libbluetooth.so.2.9.3), but nothing changes.

I've also tried a CSR- BT Stick, but even no change.

By: non-poster (non-poster) 2007-12-29 00:00:51.000-0600

I have the same problem.

SIP(1) -> Asterisk -> chan_mobile -> cellphone -> PSTN(2)

Exactly the same problem as reporter:
When I(1) speak, the other side (PSTN) hears me just in time.
When PSTN(2) speaks, it takes about 1-2 secs, to hear them.


By: Sabin (binsa) 2007-12-29 06:14:29.000-0600

dbowerrman: what about audio before connect I wrote in 0011501?

By: John Lassen (proteus74) 2008-01-06 09:36:57.000-0600

@dbowerman : Could you please tell me, which Linux Distribution use ?

By: John Lassen (proteus74) 2008-01-06 12:45:29.000-0600

Now i've installed the latest Trixbox with the latest asterisk-(addons)-trunk,
but the same problem still exists. :-(

By: John Lassen (proteus74) 2008-01-08 05:18:18.000-0600

Okay, i think you can close this issue.
I played a litte bit with the parameters at the mobile.conf :


Now, everything works fine. Thanks anyhow for your support.

By: Dave Bowerman (dbowerman) 2008-01-08 06:39:50.000-0600

ok, thanks.

btw: i use ubuntu server 7.10 with bluez-libs compiled from source.