[asterisk-users] * + Legacy PBX works but strange problem

[Sriram]

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

my dial plan is like callers dial into asterisk(span1) , hear an IVR option and they are connected to the agents via the legacy pbx (which is in sync with asterisk on span2)....This works perfectly fine until about 200 calls or so...After that time when asterisk tries to dial to the legacy pbx - the call drops with error "All are busy congested at this time" .the same is indicated on asterisk -rvvvvvvvvvv , but the spans are up and active at that time... can anyone throw some light on this ?

>>> 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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