Problems with Caller ID (VoIP and PSTN)

[emontes]

Hello,

I use Broadvoice in UK with a US number. I have a Speedtouch 780 Modem and a British Telecom phone line. When someone calls me on my Broad Voice number, the caller id works but they automatically changes my date to a month before (if someone calls today it will set my phone's date to 02/13). After this, if someone calls me in my PSTN line, the caller id won't work anymore.
Does anyone knows something about it?

Thank you,

Eryck