You can try the following way 
Install some publicly available demo sip User Agents (HearMe, Pingtel
etc) and make call between them. 
See the SIP packets using a sniffer(like Ethreal). 
Install Proxy servers like SER and make call between the user agents
through the proxy.

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Suresh P
Sent: Friday, June 25, 2004 12:08 PM
To: [EMAIL PROTECTED]
Subject: [Sip-implementors] User Agent Testing

Hi All,

        I am quite new to the world of SIP. Right now reading, to
develop 
a SIP phone ( User Agent ). Collected some details on open stacks on
SIP.
I have a clarification on the testing of the SIP phone. Please let me
know, whether two a user agents can be connected on the same LAN and
test
the voice calls between the user agents without any proxy server etc..?

 In other words whether the User agent (phone)  will have the capability
to initiate the call as well as receive the call by default as per the
SIP
standards? Or any new modules need to developed and integrated in the
SIP
phone achievde the same. Please reply.

Thanks,
-Suresh

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