We have been running a Trixbox 2.4 server for the last ~3 months and decided to move to Elastix due to it's notably better fax support and integrated IM functionality. We have a Dell PowerEdge R200 and Digium TE122P E1 card. We use Linksys PAP2T adapters in our offices and Bria soft phone on our mobile PC's. We started the installation today using the 0.9.2 stable release. We had no problems with the installation but post install realized that the included Zaptel and Libpri versions were not compatible with the TE122P as its a new card. We attempted to install kernel-devel via yum for the included -8 kernel but it did not appear available via yum. In addition, kernel-devel was not listed at http://mirror.centos.org/centos/5/updates/i386/RPMS. We needed kernel-devel to compile and install the latest 1.4 Zaptel and Libpri builds from Digium. Unable to find the kernel-devel package we decided to install 1.0-beta9. The installation went cleanly and the included Zaptel version supports the 122P card natively. We were able to get the inbound/outbound trunks configured and a test extension setup. During test we noticed that for every ~3rd or 4th call we tried to make from a handset connected to a Linksys PAP2 (we have 24 of these units) we would just got a 'busy' signal from the handset. In debugging, asterisk -rvvvv didn't even show a call attempt, /var/log/asterisk/full didn't show a call attempt and the PAP2 just said 'Invalid' for the status of the last call. The PAP2 units worked perfectly with Trixbox and did not have this problem. We are guessing its a bug or compatibility issue between Elastix and the PAP2's or something else. Any thoughts/ideas/insights would be greatly appreciated, specifically for: 1. Where is kernel-devel for the include 0.9.2 kernel available from? 2. Is the Elastix/PAP2 issues a known problem? Thanks in advance. Christopher.