Hi! I'm developing an iOS app using ipjsua example app and AsteriskNow 3.0. I've red past post about this subject and realized that to support background voip TCP must be used to communicate between ASTERISK and APP. I setup TCP inasterisk using [general] tcpenable=yes tcpbindaddr=0.0.0.0 in sip.conf file in pjsip I ocnfigured config.cfg file using: --id=sip:101;transport=tcp --registrar=sip:192.168.1.20;transport=tcp --realm=asterisk --username=101 --password=xxxxxxxxx