Need help in SIP Chat

Hello...
I am a newbie in JAVA. I'd like to create a Voice Chat with SIP.
But first of all I will try to create a chat situation, where 2 different hosts can receive AND send messages. It worked when I have a sender ONLY and a receiver ONLY. I couldnt make them put 2 abilities at all, 1 host - two in one - a receiver and sender.
I thought of making it P2P.
I am using Wireless Toolkit2.5, because at the end I will implement it on pdas or mobile phones.
Can anyone help me ? Pleeease.

i dont understand what you mean when it can only send OR receive messages. Cant you juct copy and paste code and change the relevant pieces around?

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