Look at SIP Trapezoid at http://www.iptel.org/ser/doc/sip_intro/figures/trapezoid.png (codeword "DNS-Query") or read RFC 3261: http://www.ietf.org/rfc/rfc3261.txt :-)

Dear ALL:

Question: How can UA1 know UA2 under SER2 if UA1 registers to SER1 sip server(domainA.com) and another UA2 registers to SER2 sip server(domainB.com) ?

UA1 ==> SER1(domainA.com) <== ?? ==> SER2(domainB.com) ==> UA2

Is there any middleware like freeradius or mysql to let UA1 know the location of UA2 ?

Thank you for your kind to answer my question.

Best Regard.

Charles

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