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caller and callee hear the noise when use PRA trunk witth U1960

Publication Date:  2014-12-27 Views:  158 Downloads:  0

Issue Description

the network diagram is
PSTN---(PRA)---U1960---POTS user.
U1960 version is V100R001C01SPC200
now if the POT user call to PSTN, then caller and callee both party hear the noise when talking. if make the internal call, no problem.

Alarm Information


Handling Process

1. depend on the testing scenario, we doubt the issue is related with trunk resource board---MTU.
2. do the command:
     show mrsparas
we can see the TDM codec is ulaw.
3. but actuallly custom use E1 not T1 to connect PSTN. do the command on PBX:

    config modify mrsparas tdmcodec alaw
4. test again, no problem
5. save.

Root Cause

actually custom use E1 not T1 to connect to PSTN. as for PBX, if use E1, the tdmcodec is alaw, it use T1, the tdmcodec is ulaw.


as above


before testing, check the actual network enviroment and PBX configuration.