We have received feedbacks that making outgoing ISDN calls via PSTN voice is soft.
Have increase the input gain on the mgcp trunk but it seem like little improvement.
Would like to determine the isolation of this issue ? How to ensure that within the CCM, gateway are all ok and if there is any other way to capture information which can determine is on the service provider end having the issue ?
Just to get us started: gain/attenuation changes only take effect following a controller/interface shutdown. A reset is not sufficient.
Following that Paolo is on the right track here: it matters what direction of audio is quiet: PSTN to PBX (inbound) or PBX to PSTN (outbound). You need to find a number to reproduce this with before modifying the gain/attenuation. Some PSTN destinations - or callers for that matter - will be quieter than others; a byproduct of 100-year old infrastructure and electrical distortion over distance. Don't discredit soft-spoken people or a bad headset either; make sure you are chasing a legitimate problem here!
Once you've got an agreed upon and repeatable problem you should use caution modifying the gain/attenuation commands. This is a delicate balancing act and creating an imbalance will cause echo! The echo canceler relies on a delta in electrical signals between the transmit and receive paths to find echo and suppress it. Modifying the gain/attenuation directly influences that delta. Read this document to understand what you're modifying: http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...