[Asterisk-Users] Threeway calling uses up two FXO lines

[hugolivude]

I'm running Asterisk (stable branch downloaded 2-Sep-05) on RedHat 9 and I 
have a TDM22B installed (TDM400 w/ 2 FXO and 2 FXS ports).

Everything seems to work except threeway calling. I can establish a threeway 
call, but it uses up BOTH FXO lines. Note that I DO have threeway calling 
active with my Bell service. Here's a typical scenario:

1) Call 765-1574,
2) When they answer, press flash and call 735-1056,
3) Press Flash again and I have a three way call
4) Try calling 820-2726 on the other line and I get fast busy.

Asterisk indicates that it was "Unable to create channel of type 'ZAP'" when 
I attempt the threeway call. As a result, the second call (735-1056) is 
placed on the other ZAP channel so there's none left when I attempt the 
third call (820-2726) on the other FXS line. 

There's no problem with my Bell service as I can do three way calls on BOTH 
my FXO lines when Asterisk is bypassed and my phones are connected directly 
to Bell.

Any ideas? My zapata.conf and the log of the example above are provided 
below FYI

Thanks
Hugh

; -----------------------------------------------------------
; /etc/asterisk/zapata.conf
;
; 
[channels]
language=en
context=internal
signalling=fxo_ks
threewaycalling=yes
transfer=yes
channel=>1
;
language=en
context=internal
signalling=fxo_ks
threewaycalling=yes
transfer=yes
channel=>2
;
language=en
context=external-FXO
signalling=fxs_ks
usecallerid=yes
echocancel=yes
echocancelwhenbridged=yes
rxgain=5%
channel => 4
;
language=en
context=external-FXO
signalling=fxs_ks
usecallerid=yes
echocancel=yes
echocancelwhenbridged=yes
rxgain=5%
channel => 3

; -----------------------------------------------------------
; Sample output

*CLI> -- Starting simple switch on 'Zap/2-1'
-- Executing Macro("Zap/2-1", "dial-FXO-only|7651574") in new stack
-- Executing Dial("Zap/2-1", "ZAP/3/7651574") in new stack
-- Called 3/7651574
-- Zap/3-1 answered Zap/2-1
-- Attempting native bridge of Zap/2-1 and Zap/3-1
-- Starting simple switch on 'Zap/2-2'
-- Started three way call on channel 2
-- Started music on hold, class 'default', on Zap/3-1
-- Attempting native bridge of Zap/2-1 and Zap/3-1
-- Executing Macro("Zap/2-2", "dial-FXO-only|7351056") in new stack
-- Executing Dial("Zap/2-2", "ZAP/3/7351056") in new stack
Sep 2 16:14:16 NOTICE[2652]: app_dial.c:764 dial_exec: Unable to create 
channel of type 'ZAP'
== Everyone is busy/congested at this time
-- Executing Dial("Zap/2-2", "ZAP/4/7351056") in new stack
-- Called 4/7351056
-- Zap/4-1 answered Zap/2-2
-- Attempting native bridge of Zap/2-2 and Zap/4-1
-- Building conference on call on Zap/2-1 and Zap/2-2
-- Stopped music on hold on Zap/3-1
-- Attempting native bridge of Zap/2-2 and Zap/4-1
-- Attempting native bridge of Zap/2-1 and Zap/3-1
-- Starting simple switch on 'Zap/1-1'
-- Executing Macro("Zap/1-1", "dial-FXO-only|8202726") in new stack
-- Executing Dial("Zap/1-1", "ZAP/3/8202726") in new stack
Sep 2 16:14:25 NOTICE[2652]: app_dial.c:764 dial_exec: Unable to create 
channel of type 'ZAP'
== Everyone is busy/congested at this time
-- Executing Dial("Zap/1-1", "ZAP/4/8202726") in new stack
Sep 2 16:14:25 NOTICE[2652]: app_dial.c:764 dial_exec: Unable to create 
channel of type 'ZAP'
== Everyone is busy/congested at this time
-- Executing Congestion("Zap/1-1", "") in new stack
== Spawn extension (macro-dial-FXO-only, s, 1) exited non-zero on 'Zap/2-1' 
in macro 'dial-FXO-only'
== Spawn extension (internal, 7651574, 1) exited non-zero on 'Zap/2-1'
-- Executing Hangup("Zap/2-1", "") in new stack
== Spawn extension (internal, h, 1) exited non-zero on 'Zap/2-1'
-- Hungup 'Zap/2-1'
-- Hungup 'Zap/3-1<MASQ>'
-- Attempting native bridge of Zap/3-1 and Zap/4-1
== Spawn extension (macro-dial-FXO-only, s, 103) exited non-zero on 
'Zap/1-1'
in macro 'dial-FXO-only'
== Spawn extension (internal, 8202726, 1) exited non-zero on 'Zap/1-1'
-- Executing Hangup("Zap/1-1", "") in new stack
== Spawn extension (internal, h, 1) exited non-zero on 'Zap/1-1'
-- Hungup 'Zap/1-1'
-- Hungup 'Zap/4-1'
== Spawn extension (macro-dial-FXO-only, s, 102) exited non-zero on 
'Zap/3-1'
in macro 'dial-FXO-only'
== Spawn extension (internal, 7351056, 1) exited non-zero on 'Zap/3-1'
-- Executing Hangup("Zap/3-1", "") in new stack
== Spawn extension (internal, h, 1) exited non-zero on 'Zap/3-1'
-- Hungup 'Zap/3-1'
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