How can we leverage pjsip to enable Push to talk function ? In a Push to talk, only one can talk at a time -- Khoa Pham HCMC University of Science www.fantageek.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20130605/f633225e/attachment-0001.html>