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When Cisco Unity Express is called from an IP phone or PSTN, the playback volume heard is very low

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Core Issue

There are no gain adjustments on the Cisco Unity Express module itself. The only options are to adjust signal level on the voice-ports itself.

Resolution

In order to increase the signal strength that comes in from the public switched telephone network (PSTN), you can use the input gain on the voice-ports. If the voice level is too low, you can use the input gain command in order to increase the input gain.


configure terminal
voice-port XXX  <--- appropriate voice-port
input gain 3
shut
no shut


If you access voicemail remotely, then you can use the output attenuation command under the voice-port on the router in order to increase the volume of the signal that leavies the router to the PSTN.


configure terminal
voice-port XXX  <--- appropriate voice-port
output attenuation -3 <---this would increase the outbound volume  by 3db.
shut
no shut

-3 db is a good place to start.  If it is too loud, try -2, and if it is nott loud enough, try -4.  Try to avoid to go more than -6 as you can amplify line noise and cause other issues.


Refer to these documents for more information:


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