I think the problem is the firewall.I guess you use SIP based on UDP, your firewall does not accept the UDP from outside.changing to SIP based on TCP will help From: pjsip [mailto:pjsip-bounces@xxxxxxxxxxxxxxx] On Behalf Of SSTPL (Design) Sent: Wednesday, March 12, 2014 6:34 PM To: pjsip at lists.pjsip.org Subject: pjsua with sip2sip.info Importance: High when I run pjsip console demo using sip2sip.info service, I am able to register successfully & send IM test messaged across two PCs. but when I make a call, it ends up saying that the other person is unavailable. While if I run one account on BLINK client and place a call from the PJSUA console application it works. can anybody explain what`s wrong with PJSUA or is there a bug in it. Regards, Mohsin Z Barbhaiwala, Design Dept., Spectrum Solutions & Technologies Pvt. Ltd. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20140312/f7fbc0c3/attachment-0001.html>