speaker sounds OK but handset has "tunnel" sound

Unanswered Question
Jun 7th, 2010

I am running 7965GE phones on a UC520 system.  Testing internal calls we ran into an odd problem.  A few phones have a

"tunnel" type sound when talking with the handset. The problem is the incoming voice sounds like it is in a tunnel.  The

problem phone sounds OK on the far end. Same phone using the speaker phone and incoming sound is fine.

Any ideas?


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Overall Rating: 4 (1 ratings)
David Hailey Mon, 06/07/2010 - 10:51

Are these IP to IP calls or what?  Are you using a wideband codec such as G.722?


DIEGO ALONSO Sat, 06/12/2010 - 05:00

Finally got around to getting that firmware.  Phones are 7965GE and firmware is sccp45.8-3-2s.bin.

Thanks for your help.


Jonathan Schulenberg Sat, 06/12/2010 - 06:12

Try upgrading the firmware to 8.5(3) or 8.5(4).  That version has issues; I have heard this complaint from other customers running 8.5(2).

DIEGO ALONSO Mon, 06/07/2010 - 15:40

These are IP/SCCP to IP/SCCP phones on our local LAN.  Codec is G.711u.  Will get firmware tomorrow when I get to the office.



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