Grandstream GXW4104 - Call volume very low, hard to hear and be heard

[expatel]

Customer has 4 analog telephone lines. Using Grandstream GXW4104 has the gateway. Calls in and outbound both are hard to hear. The volume is low. Have run the line diagnostics within the Grandstream. Have replaced the actual 4104. Can make calls from the analog lines, bypassing the gateway without any issues. Trying to increase the gains within the Grandstream results in echo.

Calls made on SIP trunks in and out have no issues. In my mind, this eliminates 3cx, network, system, and enduser phones as possible problem areas.

So unless I am wrong, one of two problems. Phone lines or Grandstream Gateway. Gateway has already been replaced. As said previously, calls made directly from the lines, have no issues. I am stuck.

 

[leejor]

Is there a volume difference between internal and externals calls? Are there any other types of sets , in use (3CX App, VoIP sets?) Are all of the analogue sets, the same make? Have you tried any others to see if it is a set issue?

Besides Pad settings, on the gateway, there may be"regional" settings to deal with differences in set hybrid networks. If there are, be sure that it is setup for your region/country.