SIP Communicator

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Hi,
I'm quite new about SIP. I have to modify source code of some SIP
UA.... changes are connected with modification of two LSB in PCM frame.
I have programme in JAVA so I choose SIP-Communicator and now I'm
trying to make some call beetwen two SIP-Communicators. I wonder if it
is necessery to run some SIP server on my machine to do that or maybe I
can create some free account and use it, i don't have public IP
address. Can some of you tell me location of some free servers and some
info about SIP-Communicator, is it possible to do modifications on PCM
frame level?? And if it is which package or class i should modify o
look at. Thanks for your help.

Regards, Gregory


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