[Asterisk-Users] Line Noise UPDATE - If you've got line noise, read this

[Henry Devito]

>Update further...The first conversation on the phone had the beeping as
>described above, it occurred throughout the conversation. All of the
>subsequent calls made (about 5, all less than 5 minutes) have been crystal
>clear and I couldn't tell the difference from that or my POTS phone
>connected to the local loop.

Beeping is usually caused by shared IRQ's.  Have you done a cat 
/proc/interrupts to see if there are any being shared?