[Asterisk-Users] No congestion

[Kristian Larsson]

Hey!

I'm having a small problem. I'm using Realtime to
store SIP account information. Dialing works just
fine, but when dialing a person already on the
phone I don't get a busy tone.
Eg, Phone 100 calls 200 and they chat with each other
phone 150 calls 100, and gets a regular ringing tone

what I would is for phone 150 to receive a busy
tone since phone 100 is already speking with
someone else, how would I go about doing this?

   Kristian.