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 _______________________________________________ Serusers mailing list serusers(a)lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers