Hi! > we want to always use the Asterisk server as an RTP relay. How do we need to set up the account and/or the call for that? I think that is a setting on the asterisk-side. You should have a look those: http://www.voip-info.org/wiki/view/Asterisk+sip+canreinvite http://www.voip-info.org/wiki/view/Asterisk+sip+directrtpsetup Best Regards J?rg Schwarzenberg