Sorry if I post in this forum, this may be not the right one, but I hope to find in here some experts which could help me out.
I have in one location 8 extensions from a Panasonic PBX KX-TD1232 connected to FXO Ports on an MultiVoIP Gateway from Multitech.
On the other location I have 8 SP5100 IP-Phones from Micronet as remote extensions.
Between the locations I have a VPN.
If I call from an IP-Phone to a local extension on the Panasonic PBX or if a local extension from the Panasonic PBX calls to an remote IP-Phone, the voice quality is o.k.
If I receive a call from the PSTN to a remote IP-Phone or if a remote IP Phone calls someone over the PSTN, the person on the PSTN cant almost hear anything. The voice volume ist to low.
I tried with different
Codecs with Echo cancellation or without, with silence suppression or without, on the Gateway as with the IP-Phones etc. nothing helps!
I contacted a company specialised in Panasonic PBX and with them we changed the EPROM on the PBX which increases the volume between trunk lines, but with no results.
Now I have the Output Gain on the IP-Phones set to the maximum and on the MultiVoIP Gateway I increased the Output Gain 7 db.
The Person on the PSTN
can hear now better but with calls between local extensions and remote IP-Phones, the volume is now too loud and with noise and echo.
Why everything works well with calls made from local PBX extensions to remote IP-Phones but it does not work with calls from or to remote IP-Phones over the PSTN.
Where could be the problem of this issue?
Thanks for helping in advance...
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