asterisk users - Jan 2010 - Explain what asterisk.conf's "internal timing" option is

Hello,

I've read in Mantis that asterisk.conf's "internal timing"
option could
positively impact Asterisk behaviour during faxing (
http://issues.asterisk.org/view.php?id=16374).
Before using it, I would be very pleased to read a line or two about its
use.
I've read
http://www.russellbryant.net/blog/2008/06/16/asterisk-16-now-with-a-new-timing-api/but
I still a couple of questions.

When you have a 1.6.1 server with a PSTN trunk, is this option of any use,
as in my opinion, timing is then provided by PSTN ?

Regards
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Can anyone shed any light on this error?

Will

Jan  7 11:03:34 asterisk pppd[9168]: Plugin zaptel.so loaded.
Jan  7 11:03:34 asterisk pppd[9168]: Zaptel Plugin Initialized
Jan  7 11:03:34 asterisk pppd[9168]: Using zaptel device 'stdin'
Jan  7 11:03:34 asterisk pppd[9168]: pppd 2.4.4 started by root, uid 0
Jan  7 11:03:34 asterisk pppd[9168]: Zaptel device is 'stdin'
Jan  7 11:03:34 asterisk pppd[9168]: Connected to zaptel device
'WCT1/0/1'
(65537)
Jan  7 11:03:34 asterisk pppd[9168]: Using interface ppp0
Jan  7 11:03:34 asterisk pppd[9168]: Connect: ppp0 <--> stdin
Jan  7 11:03:35 asterisk kernel: HDLC Receiver overrun on channel WCT1/0/1 
(master=WCT1/0/1)
Jan  7 11:03:36 asterisk pppd[9168]: Terminating on signal 15
Jan  7 11:03:42 asterisk pppd[9168]: Connection terminated.
Jan  7 11:03:42 asterisk pppd[9168]: Disconnect from zaptel
Jan  7 11:03:42 asterisk pppd[9168]: Modem hangup
Jan  7 11:03:42 asterisk pppd[9168]: Exit.

7 jan 2010 kl. 12.00 skrev Olivier:
> Hello,
> 
> I've read in Mantis that asterisk.conf's "internal
timing" option could positively impact Asterisk behaviour during faxing
(http://issues.asterisk.org/view.php?id=16374).
> Before using it, I would be very pleased to read a line or two about its
use.
> I've read
http://www.russellbryant.net/blog/2008/06/16/asterisk-16-now-with-a-new-timing-api/
but I still a couple of questions.
> 
> When you have a 1.6.1 server with a PSTN trunk, is this option of any use,
as in my opinion, timing is then provided by PSTN ?
If you have any DAHDI/Zaptel driver, then you have timing. The internal timing
option in asterisk.conf will affect the RTP flow in calls that use RTP.
(XMPP/Jingle, SIP, MGCP, H.323). Since the RTP system is normally clocked on
incoming packets, there are issues where you will reach a standstill - no one is
sending any packets, because both systems are waiting for a packet to arrive.
Internal timing will then take over and force Asterisk to send packets based on
the Dahdi/Zaptel timer and not based on the incoming flow.

/O