asterisk users - Jun 2004 - 3-way calling woes... Nasty static and inconsistent flash detection?

This is my setup:

SPA-2000 -> Asterisk -> X101P (x4) -> PSTN

3-way calling works fine if I use flash and dial just local extensions.
Or even if I use flash and dial one local extension, and one remote
party over the PSTN.

However, as soon as I dial from my SPA-2000 out over the PSTN, and hit
flash the call hangs-up about 50% of the time. The other 50% of the time
it puts the call on hold and gives me a dial tone. Now if I call a
second number that goes over the PSTN, and try to connect all 3 parties
(hitting flash again) it works, but I get this terrible static on the
line that blasts everyone in the ear making it impossible to talk. As
soon as one of the remote parties hangs up, the static stops and I can
continue to talk to that one person just fine.


Here is a log of the output of the inconsistent flash detection, with my
commentary:

   -- Executing Macro("SIP/705-49a2", "trunklocal|7680989")
in new stack
    -- Executing SetAccount("SIP/705-49a2", "local") in new
stack
    -- Executing Dial("SIP/705-49a2", "Zap/g1/7680989||t")
in new stack
    -- Called g1/7680989
    -- Zap/1-1 is ringing
    -- Zap/1-1 is ringing
    -- Zap/1-1 is ringing
    -- Zap/1-1 is ringing
    -- Zap/1-1 answered SIP/705-49a2

*** Testing the flash button a few times, making sure it puts the call
on hold, which it did.

    -- Started music on hold, class 'default', on Zap/1-1
    -- Stopped music on hold on Zap/1-1
    -- Started music on hold, class 'default', on Zap/1-1
    -- Stopped music on hold on Zap/1-1
    -- Started music on hold, class 'default', on Zap/1-1
    -- Stopped music on hold on Zap/1-1
    -- Hungup 'Zap/1-1'

*** Intentionally ended the call, to immediately call back and try
again.

  == Spawn extension (macro-trunklocal, s, 3) exited non-zero on
'SIP/705-49a2' in macro 'trunklocal'
  == Spawn extension (local, 7680989, 1) exited non-zero on 'SIP/705-
49a2'
    -- Executing Macro("SIP/705-37c1", "trunklocal|7680989")
in new
stack
    -- Executing SetAccount("SIP/705-37c1", "local") in new
stack
    -- Executing Dial("SIP/705-37c1", "Zap/g1/7680989||t")
in new stack
    -- Called g1/7680989
Jun 25 16:56:12 WARNING[1191312304]: app_dial.c:338 wait_for_answer:
Unable to forward frame
    -- Hungup 'Zap/1-1'

*** Pressed flash, it hung up. So called back to try it again.

  == Spawn extension (macro-trunklocal, s, 3) exited non-zero on
'SIP/705-37c1' in macro 'trunklocal'
  == Spawn extension (local, 7680989, 1) exited non-zero on 'SIP/705-
37c1'

    -- Executing Macro("SIP/705-bb8f", "trunklocal|7680989")
in new
stack
    -- Executing SetAccount("SIP/705-bb8f", "local") in new
stack
    -- Executing Dial("SIP/705-bb8f", "Zap/g1/7680989||t")
in new stack
    -- Called g1/7680989
    -- Zap/1-1 is ringing
    -- Hungup 'Zap/1-1'

*** Pressed flash, it hung up.

  == Spawn extension (macro-trunklocal, s, 3) exited non-zero on
'SIP/705-bb8f' in macro 'trunklocal'
  == Spawn extension (local, 7680989, 1) exited non-zero on 'SIP/705-
bb8f'


I don't have any logs of the 3-way in progress when I was getting the
static. The static only happens when the two outgoing channels are ZAP.
I wonder if the static has anything to do with the echo cancellation
just committed in to CVS that I'm using? I'll have to test this theory
when I get a chance tomorrow.

I'm running CVS Head from yesterday. As well the SPA-2000's are running
firmware 2.0.8, and there are no IRQ sharing conflicts.

So, any ideas why Asterisk is sometimes putting the call on hold when
flash is hit, and other times just hanging up? The flash button
obviously works. As well, what would cause the nasty static when a 3-way
call with 2 of the parties connected over the PSTN finally does work?

Notable lines in my zapata.conf file:

context=mainmenu
signalling=fxs_ks

rxwink=300              ; Atlas seems to use long (250ms) winks
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
musiconhold=default
faxdetect=both

echocancel=yes
echocancelwhenbridged=yes
echotraining=800


-- 
Mike Benoit <ipso@snappymail.ca>