Hi to all, shortly i'll make a pbx for a customer that uses a couple of isdn bri lines and, looking for hardware, i've seen that not too much expensive isdn cards that works well are the ones that uses hfc-4/8s controller (specifically i'll use a OpenVox B200P that has 2 ISDN ports and use an HFC-4S controller). I've seen that FreeSwitch doesn't support mISDN but uses openzap (trough ozmod_isdn.so). I got some serious troubles using OpenZAP on analogical lines (bad dtmf recognition on fxs ports (like press 4 and get 44), annoying noise, busy/hangup tone unrecognized [tones, in italy, differs by cadency and not frequency], and more). Using tone_detect i bypassed the tone recognition problem and the noise was however acceptable: the blocking problem was the bad dtmf recognition. In the end (hope god forgive me) i put asterisk as (*1*)(*2*)sip proxy between zaptel and freeswich: i need to fix in config hangup cause detection but it seems to works fine. So my questions are: - Do freeswitch supports mISDN? - If it doesn't support mISDN, tone and dtmf recognition will be done by the isdn card, the kernel module or will be done by openzap? - There are alternative ways to use (*3*) mISDN with freeswitch, apart put asterisk as proxy? Thank for your support! Best Regards, Daniele --- (*1*) At beginning i tried using IAX but freeswitch segfaults when it try to answer the call and when i reload the module (trought reload mod_iax) shutdown routing didn't get called(the used iax library, smartly, start using another port without saying anything), however i need to do more testing: hope to open some tickets on jira in short. (*2*) I've seen that mod_iax config file support a "context" variable, but it isn't used so i wrote a small fix to use it if context isn't specified in the iax request (*3*) I need to use mISDN, rather other things, because i should use octasis soft echo cancellation and them supports only mISDN and Zaptel modules