I have a Trixbox 2.8 phone system running Asterisk 1.6 connected to a Cbeyond SIP trunk. We are using Polycom Soundpoint IP 550 telephones. I would like to be able to enable long distance password codes through Cbeyond so we can restrict long distance calls to certain phones. However when I enable these long distance codes through Cbeyond's online control panel and dial a long distance number, I get one-way audio. I am able to hear the called party, but they are not able to hear me. I have updated the phone system (using yum update) to the latest version and have also tried changing the "reinvite" setting on the trunk to yes and no. Cbeyond tells me it is a bug with the RTP stream being sent to Cbeyond's network once the long distance codes are entered. The process up to the entering of the long distance codes goes normally, but after the phone call is passed to the called party the REINVITE data no longer makes it back to our Asterisk system. What can I do to resolve this problem?