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wrong configuration lead to cannot call out

Publication Date:  2013-12-31 Views:  107 Downloads:  0
Issue Description
espace U1980 connected with PSTN via PRA link. Sometimes cannot make outgoing calls, the error code shows there is no connection available.
Alarm Information
Handling Process
Confirm with customer there are only 2 PRA link is in use, so use below command to remove the last 2 E1 ports. (configured the last 2 E1 ports to an invailable office to remove it)

config modify board slot 8 type dtu trunkport 2 officeno 254
config modify board slot 8 type dtu trunkport 3 officeno 254

then test again, problem solved.
Root Cause
check the configuration of trunk configuration by show "show trunk status slot 8 portinboard 0", got below result

E1T1 Information

GlbE1T1 BoardType Trunkport Office ProtocolType CRC State 
------- --------- --------- ------ ------------ --- ------
56      DTU       0         0      PRA          YES NORMAL
57      DTU       1         0      PRA          NO  NORMAL
58      DTU       2         0      PRA          NO  LOS   
59      DTU       3         0      PRA          NO  LOS    

from this we know all the 4 port is configured as office 0, but only the last 2 ports is abnormal. That maybe the cause.

Need to notice the trunk port configuration when add it.