asterisk users - Mar 2003 - VERY bad sound on S100U -> X100P calls, and caller id problems ...

Hi folks!

I'm using an X100P (connected to my phone line) and an S100U, and when I
calls out from the phone connected to the S100U it is a very bad sound
quality, it "pops" and "jitters" a lot.
But internal calls from for example a SIP client to the phone on the S100U
sounds good. Calls from an SIP client to the outside world using the X100P
also works good!

My second problem is that I don't get any caller ID when an outside call
arrives, it rings both an SIP client and my analogue phone but no caller
ID.
When i call internal to the S100U I get caller ID on the analogue phone.

Here in Sweden where i live the format for receiving caller ID looks like;
A number C

And as far as I know the frequencies for DTMF are the same all over the
world?

(I have callerid=asreceived in my zapata.conf for the X100P)