<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hi all,<br><br>My Asterisk connect to GSM core network (connect directly to MSC) through E1 lines. What the kind of protocol is used ?. It is ISUP/SS7 protocol ?<br><br>Thanks in advance<br><br></td></tr></table><br>