We have the following configuration on a TD500. 
 
Slot  Basic    Expn.#1  Expn.#2

01   PRI30       PRI30         -        
02   -        -          -        
03   PRI30       PRI30         -        
04   -        -          -        
05   -        -          -        
06   -        -          -        
07   ESLC       ELCOT        -        
08   ESLC       DLC            -        
09   ESLC       ESLC          -        
10   ESLC       ESLC          -        
11   ESLC       ESLC          -        
12   ESLC       ESLC          -        
13   CPU         ESLC          -        
14   TSW        ESLC          -        

Configuration :
KX-TD500 + 2xTD50290 + 6xTD50175
KX-TD520 + 2xTD50290 + 6xTD50175 +TD50172 + TD50180
120 SLT + 8DPT (KX-TD7433)

 
110 extensions are installed (app. 10 SLT telephone / card) with SLT
model KXTS-2308. The 120 channels on the 4 PRI cards are configured only
for outgoing calls.
 
Symptom :
 
During the heavy traffic (more than 60 %) the DPTs stop functioning and
after 1H  the system is blocked.
If only 3 PRI cards are installed the system is functioning normaly.
When the 4th PRI card is installed, 
DPT extensions displays flash for a couple of seconds and after that
(this happens on DPT extensions):
1. If someone tries to off-hook the phone or press Speaker-phone button,
the dial-tone arrives with a delay of minimum 4 seconds (the
Speaker-phone led lights up with the same delay);
2. When someone tries to dial a number from a DPT extension the same
problem occurs on the display - the dialed number appears after 30-40
seconds from the moment it is dialed;
3. All the digital extensions stop functioning (no dial-tone, no
display).
4. The traffic on the CO lines (channels on the PRI card) is reduced
from the initial 60% to 10-20%.
5. After app. 20 minutes, the PBX blocks and enters a overflow loop. A
restart of the system is necesary for unblocking.
IMPORTANT!!! All of this happens when 4 PRI cards are used on the
system, but no error is reported by the system. If only 3 are used (90
ch.) everything is fine.
 
Any opinions?


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