Cisco PAP2T - A VoIP adapter for 2 telephone lines

The Cisco / Linksys PAP2T lets you connect your analogue phones to VoIP services via SIP.

How to configure it: http://spakonfig.de/

Currently it costs ~40 EUR in Germany: http://geizhals.at/deutschland/a212387.html

Cisco SPA-3102

An alternative is the Cisco SPA-3102 which also connects your phone to a classical landline connection (for failover / emergency calls).

Grandstream GXP-2000 Phone

If you want to get rid of your old analogue phones and want to get a decent VoIP/SIP phone, you might want to hava look at the Grandstream GXP-2000 (on Wikipedia and voip-info.org).

It costs ~60 EUR in Germany http://geizhals.at/deutschland/a174281.html

A modern (and expensive) alternative is the Grandstream GXV3175 7" Touchscreen IP Multimedia Phone which costs ~ 320 USD or ~ 240 EUR.

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