Hi
below are my configs:
pstn(e1)--->asterisk (span1)----->legacy pbx(connected via span2)-----> legacy 
analog extensions.

my dial plan is like callers dial into asterisk(span1) and they are connected 
to the agents via the legacy pbx (which is in sync with asterisk on 
span2)....the prob is when people call and when asterisk attempts to transfer 
the call, the call dconnects with CHANUNVAIL error...

>>> ZAPTEL.CONF 


span=1,0,0,ccs,hdb3,crc4
span=2,0,0,ccs,hdb3,crc4

bchan=1-15
dchan=16
bchan=17-31

bchan=32-46
dchan=47
bchan=48-62
>>> ZAPATA.CONF 
context=pri-pstn
switchtype=euroisdn
pridialplan=local
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
group=1
callgroup=1
pickupgroup=1
immediate=yes
musiconhold=default
signalling = pri_cpe
channel => 1-15
channel => 17-31

context=pri-legacy
immediate=yes
group=2
overlapdial=yes
signalling = pri_net
channel => 32-46
channel => 48-62>>> EXTENSIONS.CONF 
;
; Context PRI-Public
;
[pri-pstn]
;
include => default
;
exten => s,1,Answer                   exten => s,2,Dial(Zap/g2/1888)    ; Dial 
to legacy pbx and sends the 4 DID digits needed for the legacy pbx
exten => s,3,Hangup
;
; Context PRI-legacy
;
[pri-legacy]
;
include => default
;
exten => s,1,Answer                          
exten => s,2,DigitTimeout,2                
exten => s,3,ResponseTimeout,2        
exten => _X.,1,Dial(Zap/g1/${EXTEN})
exten => _X.,2,Congestion
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