asterisk - receiving service from SIP without using a server -


i new asterisk , ask question receiving service sip without using middle server. in fist scenario, 2 agents communication each other using middle-way sip server has asterisk installed on it. however, method not reliable if server goes down, communication lost. in other scenario, want sip installed on 2 agents willing communicate each other, without using middle-way sip servers. latter case more reliable , beneficial former? pros , cons of each model? , unfortunately, newbie couldn't find direct material implementing second scenario asterisk. give me hints please.

sip has been conceived used peer peer protocol, in case both agents need know each other ip addresses (this works if both addresses public or both agents in same lan). if server used, both agents need know server ip address. in case, once communication established between 2 agents, rtp packets exchanged directly, without server in middle. in cases sip server (like asterisk) needed in order handle possible situations (remote agent not available, voice mail, etc.).

in theory, possible have peer peer voip protocols when both agents on separate lans, technology in stage (e.g. retroshare http://retroshare.sourceforge.net).


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