[VoIP] WE 2500 question

[Jayson Smith]

Hi,
On Friday I won a Western Electric 2500 desk phone. I got it in the mail
today, and am having a problem with it, and am just wondering if I got a
defective unit and need to contact the seller, or if this is a known issue.
The phone works fine when hooked up to my Bell South POTS line. However,
when hooked up to either my IAXy or an unused but powered Packet8 BPA-410
ATA, the keypad doesn't work. When I press a key, I hear a very brief bit of
the proper touchtone, but it's nowhere near enough to register. When doing
an echo test, there are little blips that I can hear on another phone, which
continue for as long as the key is held down. Is there a problem with the
power provided by these devices, or is the phone defective? Once again, it
works fine on my PSTN line.
Thanks.
Jayson