I look here often for advice. You guys are great.
3640 Router in Mexico, E-1 to US with a functional AVVID network. No PRI/BRI on Mexico router.
I'm trying to route calls from Mexico to local PSTN through FXO port. Calling the FXO port from PSTN rings the DN VoiP phone for 1/2 second then phone hangs up. FXO link light remains lit until unplugged. Call from VoiP phone to FXO gets a fast busy. I've tried changing from Loop Start to Ground Start and tried supervisory disconnect anytonebcptone MX on the voice port.
CCO recco'd an IOS upgrade with no results. Running MGCP and IOS Ver 12.2(46a) CCM ver 4.1(3)