Using business VPN connection - no local addresses reachable in business network

Hello everybody,

Let me describe my problem. But first my technical environment:

iPhone 5, iOS 7.1, Cisco VPN connection IPSec, WLAN connection to my FRITZ!Box

I connected to my business network via Cisco VPN. Everything works fine, but when I try to reach an local host name e.g. HRWORKS the DNS server in the business network could not be reached.

What should I do?

Stefan