- This topic has 6 replies, 1 voice, and was last updated 16 years ago by Ashish Goel.
11th January 2005 at 08:14 #40479sakurabaGuest
We have problem with silence MMC calls (Siemens BSC and MSC). When subscriber make a call the other side is having ring, and then is a silence, after his answer. After that, on the next attempt call is usually successful.
Is there way to find a solutions on some measurements for this?
Or is there any idea to solve this problem….
Please help.12th January 2005 at 05:38 #40480Mohsin IsmailGuest
Usually when it happen, it was related to A interface trunk (between TRAU and MSC). one of or may be more of your trunk is in not good quality. So when a call sieze that trunk it recieve that problem. Here i’m suggest that, you check the trunk quality, for example every MSC have one command to check the PCM quality or via the trunk traffic analysis, or make a test call per trunk basis..
hope it can give as a guide for you.12th January 2005 at 07:00 #40481MikhailGuest
If the trunk is newly added, the possible reason can be inconsistent CIC between MSC-BSC. I already met such problems13th January 2005 at 07:46 #40482sakurabaGuest
Thanks for your help!!
But the problem is solved after restart some defective TRAU units.
Best regards!15th April 2005 at 06:22 #40483ASAD MAHMOOD KHANGuest
Hi u all,
If this types of problem persists long then we may guess for CIC mismatch so as it was clear that second attemt it was ok so definetly prob was not with CIC
asad15th April 2005 at 13:47 #40484DariushGuest
I faced with same problem and there were not any Cic mismatching then i found out this problem occour becuase of TRAC(obviously,the tracs sometime need test and restart becuase of software damage in it) in transcode after testing Trau(Trac)or restart on trau it was solved.
Dariush26th April 2005 at 16:26 #40485Ashish GoelGuest
u can also run a performance test on the trau and check whether it fails or not. Failure means there can a problem in the TRAU.