Can anyone give some help with the following 2 problems Im having on a system which we are testing before it goes live in a few weeks. I have tried to include setup details below.
My setup consists of:
P4 3.2ghz 2gb Ram
Adaptec Scsi raid card (raid 1)
1x te205p e1 card for our uk Bt isdn30e line. (23 channels)
2x tdm400 for 8 analogue lines. (lines linked to some mobile phone dock n talks but only few calls on these per day)
The cable between the e1 card and the BT isdn box runs over some offices so its around 75 feet long. (made just with normal rj45 cable and 2 crmp plugs not shielded).
(CAN ANYONE TELL ME IF THIS IS OK LIKE THIS ??)
Software consists of Redhat FC3 with all the updates and Zaptel 18.104.22.168 (mark2 echo and aggressive echo cancelation enabled) and Asterisk 1.2.11
I also have 55 grandstream gxp phones(half have the latest firmware 1.1.14) Gxp2000 uses the ulaw codec.
Also the windows workstation pcs connect via the passthrough rg45 port.
Our network is made up 1 main gigabit switch which our servers are on ie web-email-file and 2 smaller switches with 1gig uplink to the main one which most of our telesales are wired to 100mb.
Overall the system works very well except for the following 2 problems which im now a bit stuck on what to try.
The problems we seem to get are replated to calls on the isdn30 line:
We quite often can hear a crackle on the gxp2000 handset which is worse when we turn the volume up.?
We have the VXI Passport Headsets 10V and 20V and customers are always saying that the sound they hear is breaking up which makes for a poor call. I have tried the rx-tx gain using the ztmonitor util.?
Do you have to use headset amps?
RX can be between 40-100% on different incomming calls
TX is normally around 30-40% increasing tx gain does not make much change.
My config settings are:
channel => 1-15,17-25
Anaglogue lines config left out.