I’ve got gsm <-> pstn gateaway and would like to connect it to my * box. When connect it to analog pbx it works ok. (I dial the number of gw from phone, gateaway answers and I get the dialtone to dial the number). The problem is when I connect it to the FXS (tdm400p) of my * the gateaway answers immediately.
Consequently, when I try use the gateaway ZAP/4 is always busy. Using ztmonitor I see that * just after the connection to gw sends and gets tone and after 20-30 secs begins to send busy signal.
So why does * begin to use the channel. Can I hangup it manually? Maybe I can somehow to connect to it (smth like making a conference). What’s the difference between FXS of analog PBX and FXS of tdm400p?
I have no idea what to do. Please, help.