Phone volume issues

Unanswered Question
Apr 25th, 2012

We are currently running 2 UC560 systems. Both systems are almost identical all phonecalls going to AA and next to BACD except one is using SIP trunks only and this system is working fine and second system is using mix of FXO & SIP and on this system phone volume is very low when receiving phonecalls (via FXO or SIP). Does anyone had this kind of problem before? Is there any way to fix this problem?

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David Trad Wed, 04/25/2012 - 22:58

Hi Pawel,

The UC's have an issue with audio quality when using the SPA phones in conjunction with analogue (FXO) lines, there is little that you can do to improve it a great deal, however SBCS can assist you with some approved CLI changes that will up the gain levels on the Voice-Port... However I caution you in doing this as it can introduce reverb and at times echo to the line, this is a variable thing and may not be imediatly identified by the SBCS support representative, it could take days before the issue surfaces.

However if you use an ISDN/PRI or SIP trunk, the audio quality is brilliant, this is an FXO line issue in conjunction with the SPA series phones, you can avoid this by using the 7900 series phones or the 6900 series, both of them do not suffer from this issue in my experience



Pawel Lenart Sat, 04/28/2012 - 03:50

I tried to get help from Cisco but we are do not yet have UCS  specialization so they will not support us on CLI. David, so If now I  disable FXO ports, volume should be better or this is known issue with  every UC560 with build-in FXO ports (regardless of using / not using  FXO)?

David Trad Sat, 04/28/2012 - 05:06

Hi Pawel,

I am really sorry to hear that this has happened to you, this is a well

known and well documented problem and I am getting increasingly frustrated

with them denying people CLI support regarding this problem.

I would highly encourage you to get a duty supervisor involved through an

escalation process, they should not under any circumstances be denying you

support for this problem.

Please do not try and work on this on your own, if you originally set this

system up using CCA, you should do everything required to keep it within

this scope, I would be derelict in my duties if I didn't reinforce the

issue of maintaining CCA compliance, please escalate the issue with SBCS.

If there is a Cisco Support rep monitoring this thread, please do the right

thing by Pawel and have this issue attended to and have proper support

given to resolve this issue... If I can also suggest that you educate the

staff to properly and thoroughly investigate an issue before dismissing

support because of no UC specializations, it is a poor indictment on Cisco

to do otherwise.

On Apr 28, 2012 8:50 PM, "lenartpawel" <

Alexander Maroukian Sat, 04/28/2012 - 10:42

Hi Pawel,

Where exactly the volume is very low? On FXS port or on the IP phones? On your side or the callers from outside cannot hear you when they call? What are the phones with this problems?

Please answers the questions above to get the problem properly.

Best regards,


Pawel Lenart Wed, 05/02/2012 - 04:52

Hi Alex,

Sorry about delay. They have this volume problem on IP phones (they don't use FXS). When I'm calling / they are calling volume is very low on their side (they can hear me fine, I hear them but volume is low). All phones have the same problems.

Alexander Maroukian Fri, 05/04/2012 - 02:28

Hi Pawel,

Please tell me what is the model of the phones and what is their firmware. Is this happenig using the SIP trunk.

Best regards,


Pawel Lenart Sat, 05/12/2012 - 04:25

Phone model is SPA504G and firmware: 7.4.8

I know newer firmware is already out but I have second UC500 with same firmware and I don't have this problems with my second UC500 without FXO ports.

Alexander Maroukian Sun, 05/13/2012 - 05:21

Hi Pawel,

Could you tell me if you attach another 79xx series phone is the volume still low?

Best regards,


David Trad Sun, 05/13/2012 - 16:02

Hi Pawel,

It will be interesting to see your results as in all my tests that I have done, the 7900 series was never faced with the volume issue when the system ran on FXO connectivity.

Cant wait to see the outcome



manuelcalvetjimenez Thu, 07/12/2012 - 03:52


    Same issues with same phones, 23 SPA504G with SERIOUS voice volume problems, latest firmware but no improve of sound volume.

    Client is starting to get rid of it.... And I am waiting for any CISCO answer, and waiting.... and waiting....

Any news?????



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