Hi!
You can use the following command on voice ports that receive external calls:
-------------------
Router(config-voiceport)#input gain ?
<-6 - 14> gain in db
The ? value is greater than 0 (0 is the default, the measurement is in decibels. The range of values for input gain is -6 -> 14dB). I would recommend that you start with a 2 dB increase. You should notice an immediate change in the volume of the call. Be aware that increasing this value can introduce some echo, so you might need to test.
Also there is this command:
Router(config-voiceport)#output attenuation ?
<-6 - 14> attenuation in db
As far as I know there is no parameter on the CUCM to incease the volume of a call.
Hope this helps! :)
Regards,
Tere.
If you find this post helpful, please rate! :)