[Asterisk-Users] tdm (and x100p?) echo - fix is coming!

[Brent Franks]

> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com [mailto:asterisk-users-
> admin at lists.digium.com] On Behalf Of Rich Adamson
> Sent: Thursday, June 24, 2004 5:01 PM
> Be careful with that thought... here's the three lines that were
> manually changed for testing purposes only (these would have been
prior to
> yesterday's change to chan_zap.c):
> ~1195:  x = 800;
> ~1636: strcpy(p->echorest, "ww");
> ~1637: strcpy(p->echorest + 2,
> 
> Changing x = 400 to x = 800 fixed the echo problem, but caused
outbound
> dialing to totally fail. The pstn line would be seized, but the dtmf
> sent to the CO was less then acceptable.
> 
> Changing lines 1636 (from "w" to "ww") and line 1637 (from "1" to "2")
> brought the outbound dialing back into a functional state. Since I'm
> not a programmer, I don't really know what those lines are doing.
> 
> Mark then used that info to write the code for implementing
> echotrainging=800 as a configurable option.
> 
> Does today's code support changing all three values? (Since the
example
> in the config files suggest two specific choices, I'd bet that using
> a value of 600 or 1200 or whatever does cause an issue with the
outbound
> dialing, etc.)

My report....

With our current setup we have an Adtran TotalAccess 750 connected to a
T100P.  There are 5 incoming FXO lines from Verizon.

We use about 15 Polycom SIP IP500 phones.

I updated to today's CVS and still noticed an echo in the middle of
nearly every call.  The echo would come in after 2 or 3 minutes, last
for 30 seconds and then disappear. I will report on our user's
experiences tomorrow.

Regards,

- Brent