10-07-2014 08:25 AM
Several of my users are complaining about hearing a "loud noise (sounds like a modem picking up)" when an external person places a call to the campus and the VoIP system using Single Number Reach (SNR) forwards to their cell phone. The problem started about 3 months ago and it is getting worse. All the user have company provided iphone 5s. The 'loud noise" usually happens after 5 minutes and it seems to happen to the some users more than others. I get dozens of calls each day but I have only had it happen to me once.
We are running CUCM 10.5 (but was happening on CUCM 8.5 also). We use PRI for connectivity to the PSTN. Is this a internal VoIP issue, a gateway DSP issue, PRI service provider issue or wireless cellphone issue? Any body else seeing this same or like issue?
08-02-2016 05:56 AM
Hello,
We are experiencing the same exact issue at the present time. We are running MGCP on the Gateways, CUCM 10.5, and PRI for connectivity to the PSTN . I would like to know if you have resolved this issue and if so can you provide steps taken to mitigate it.
Thanks
08-11-2016 06:41 AM
Try to force a voice codec, e.g. G.711, disable comfort-noise, disable silence suppression, update DSP firmware.
Regards.
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