Hello to the group, I just install a new Asterisk system in order to be used as controller of a radio shack. I install Suse Linux ver. 10.1 with Kernel 2.6 I install Asterisk-1.2.14 including app_rpt with a TDM400P with 2 FXS daughter boards. I wiil use the simplex interface as described at http://www.hamwlan.net/images/FXS-SIMPLEX-RADIO-V2.jpg in order to interconnect a series of simplex UHF radio to create a network. Trying to test the system I hooked 2 analog telephone sets replacing the radio interfaces. Using information send from your very helpful friend Francois BERGERET (f6hqz-m@hamwlan.net) I made adjustments to the pertinent files as follows: # zaptel.conf e&m=1-2 loadzone=us defaultzone=us # #EOF # Meaning 2 FXS ports configured as E&M signalling. ;zapata.conf [channels] callwaitingcallerid=no echocancel=yes echocancelwhenbridged=yes echotraining=no relaxdtmf=yes adsi=off usercallerid=yes callgroup=1 pickupgroup=1 group=1 signalling=em_rxtx immediate=yes context=channel1 channel=1 context=channel2 channel=2 Meaning 2 FXS ports signalling = em_rxtx and immediate = yes ;rpt.conf [1999] ; Node ID of remote base rxchannel = Zap/1 ; Rx audio/signalling channel remote = n duplex=0 [1998] rxchannel = Zap/2 remote = n duplex=0 [functions-remote] [telemetry] [morse] [nodes] 1999 = radio@127.0.0.1/1999 1998 = radio@127.0.0.1/1998 [memory] ;extensions.conf [general] static=yes writeprotect=no autofallthrought=yes [globals] [default] [channel1] exten => s,1,rpt(1998|D) exten => s,n,Hangup [channel2] exten => s,1,rpt(1999|D) exten => s,n,Hangup With the above configuration we tried to configure the system as to automatically call the other set each time the one goes Off Hook. But this was my desire. Unfortunately the system is fully silent. When I modified the line in zapata.conf from signalling=em_rxtx to signalling=em the system started to call as expected. Substituting the telephone sets with the radio interfaces, making a test I have the following situation: 1. Incoming call is answered OK. = PTT is energized 2. Initiating side receives a ring back condition. As consequence I loose the capability to release the line using the COR/BUSY control. Making measurements at the RING/TIP pair I found that incoming call reverses the polarity of the line and stays at this condition until the line is released some how. At the initiating side (Rx) the polarity is RING - TIP = -48V at idle. When COR/BUSY control change state the Opto opens and the call is initiated. But after some milliseconds polarity reverses causing the receive opto to open and the system is in answer condition. In order to release the line I have to disconnect manually the RJ45 from the board. Is any one to help me? Niagassas Angelos Project Manager Tel. +30 210 4821492 Mob. +30 6977919262 Messenger: niagassas@hotmail.com eMail: niagassas_ang@tellas.gr