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View Full Version : Original First attempt call unsuccessful...need help.



kiran0468
2011-07-03, 07:44 PM
Problem : First attempt call not connected. Calling, Calling....continues.
Nortel GSM BTS, MSC. Can anybody suggest reasons for this & parameters to check at OMC-R/MSC.

T_ADD
2011-07-04, 10:13 AM
then how about a 2nd attempt???:lol

s52d
2011-07-04, 12:34 PM
Problem : First attempt call not connected. Calling, Calling....continues.
Nortel GSM BTS, MSC. Can anybody suggest reasons for this & parameters to check at OMC-R/MSC.

First quess: VLR.
You remove users from VLR too fast, timers in MSC and BSS (T3212) should match.
When a call is made, it is rejected by "IMSI unknown in the VLR".
After terminal registers, it is all OK.

For such problems you need to see signalling: either TEMS or NEMO or simmilar product.
Just guessing is not best method, especially when time is running and users are complaining.

BR
s52d