I started working on a SIP client for a VoIP application we are developing at work. Most of the code is in Java, so we wanted to handle SIP on Java too.
However, I must say that SIP libraries for Java seem to be a bit scarce. There's jain-sip, which is a low level SIP library that basically handles message formatting, but there are no high level APIs to implement a simple SIP phone, for example.
Jain-sip Lite (an API intented for SIP user agents) is no longer under development, even though much of its functionality has been absorbed by jain-sip. Theres also jsip which has also been abandoned.
SIP (described on RFC3261) its quite simple, but the call/transaction/dialog management (which changed from the previous version of SIP) and rules that define when to create a new transaction, can become a bit complex, at least for a newbie (like me for the moment;)).
Im currently trying to define an abstraction layer over jain-sip which will allow me to define sip interactions as java classes (similar to the ideas in FIPA Agent architecture which defines behaviors). After that, I plan to wrap some interactions inside a SIPPhone class, to allow me to make simple calls such as call(<sipaddress>), or register(<publicaddress>,<registeraddress>). I'm still have to think about how to handle incoming calls and the sort, but I suppose I will figure it out :P.
I'll post if there are any advances or I if decide to rewrite the whole thing and drop the interactions idea:P.
Sunday, August 14, 2005
Virtual universe inflation rose 20% on saturday, hackers blamed.
Doing my weekly Gamespot navigation, I found this article. Apparently a group of hackers created a skyrocketing inflation in Ever Quest 2.
Is it me or news are becoming more and more science fiction like? It's also impresive the Station Exchange service, that allows EQ players to trade ingame goods for US dollars. This was done in ebay before, but obviously Sony realized that there was an oportunity here. I suppose that someday, in the near future, one will be able to make a living by playing MMORPGs. I somehow find that a bit frightening.
Is it me or news are becoming more and more science fiction like? It's also impresive the Station Exchange service, that allows EQ players to trade ingame goods for US dollars. This was done in ebay before, but obviously Sony realized that there was an oportunity here. I suppose that someday, in the near future, one will be able to make a living by playing MMORPGs. I somehow find that a bit frightening.
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