Network setup: ISR 2821, CCME4.1, pvdm2-32, Configured dsp for hardware conferencing
Whenever an outgoing call is made, and is rejected by the external party, The FXO port is not disconnected, it does not free up the port for new incoming/outgoing call.
A manual shut and no shut is done on the voice ports when this problem arise.
We tried to set it to groundstart. Battery reversal. with supervisory disconnect, but to no avail.
*note* However this is not a problem when the IP phone user terminates the call instead