[cisco-voip] Echo on IP Phone with PRI (CME)

[Erick Bergquist]

Hi,



I am having issue where users report echo on the IP phones
every now and then that lasts the whole call. The echo they hear is
their voice back on the IP Phone. The outside party does not hear echo.



The T1 PRI controller is clean, no errors and the router
network-clock is set to use the PRI. 

CME is on a 2811 with IOS 12.4(6)XE2
, c2800nm-ipvoicek9-mz.124-6.XE2.bin


Have tried different echo cancel coverage settings and input/output gain adjustments. They had no echo for almost a week then had it frequently for 1-2 days and now it is good again for past 2 days.

voice-port 0/0/0:23

 input gain -3

 output attenuation 3

 music-threshold -45



The phones are 7941s and firmware 8.0(4)SR2 -- is it safe to try latest firmware version on CME without IOS update?


Any ideas?



       
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