I download mod_openzap on Aug 14 2007 and have been trying to use it with a Digium TDM400P card. Sadly it has crashed on me in two places :(. I was going to raise a bug in Jira, but this module is not listed as a component under Project: endpoint modules, so I am just mentioning it here instead :). The first crash I believe is due to the passing of an address to a pointer instead of just the pointer. mod_openzap.c:804 has the call: if (!(session = switch_core_session_request(&channel_endpoint_interface, NULL))) { this should be: if (!(session = switch_core_session_request(channel_endpoint_interface, NULL))) { The second crash I do not fully understand :(. When I try to place a call using an analog phone connected to the TDM400P, freeswitch crashes after the first ring. I traced the crash to switch_core_io.c:152 due to (*frame)->codec being NULL. This should have been set via a preceding call which resolved to the function channel_read_frame in mod_openzap.c. Sadly this call returns at mod_openzap.c:464 without (*frame)->codec being set :(. This is because tech_pvt->cng_frame never has a value for codec. I do not understand anywhere near enough to know what the correct fix is for this. As a quick hack, I set a value for this at line 228 with: tech_pvt->cng_frame.codec = &tech_pvt->read_codec; but I am not sure this is the right solution :/. These two changes have allowed me to progress to the next stage of my testing, but I would like to know if they are correct. Regards, Craig.