Base station causing interference with cable modem

I have a late model apple airport extreme base station with time machine. The unit is placed next to the cable box (that provides phone service) that connects to the modem that connects to the base station. When the base station is turned on and working (we use wifi ) there is a nuisance noise in the phones when making and receiving a call for the first 20 to 30 seconds and then disappears. When the base station is disconnected there are no problems with the phones.
Is there such a thing as shielding for the cable box and/or modem? Or is there a simpler solution?
Thanks in advance!
Luc

Hi thanks for your response.
I use a VOIP phone system provided by the cable company (no phone filters required). The VOIP connects to an analog phone management system called Talkswitch. So I have three VOIP lines connecting to the Talkswitch box and 7 lines leaving the Talkswitch box connecting to analogue phones (wired) throughout the office. So to recap:
Cable company line connects to a VOIP Box (ARIS TM604G).
A modem (Thompson DCM475) connects to the the VOIP Box and to the Apple Extreme Base station (with Time Machine).
Three phone lines connect the VOIP Box directly to the Talkswitch Box. The Talkswitch Box is NOT connected to the Apple Base Station.
The server (Mac Mini) is wired to the Apple Base Station.
When I make or receive a call there is a buzzing sound in the line. Sound disappears after 20 to 30 seconds.
When I turn the Base Station off (disconnect) the buzzing sound disappears.
When I leave the Base Station ON and I connect a phone directly to the VOIP Box, there is no buzzing.
I can only assume that the Base Station is interfering with something. Is it the Talkswitch box or the phone cables?
Should I move the Base Station further from the Talkswitch box? or Use shielded cables (which ones)? Or is there another solution? Or is it a voltage problem?
Thanks!
Luc
PS : I did not have this problem with the older Apple Base Station. Is the new one too powerful?

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