Cisco CM to NEC ext dialing.

[Oldtimephoneguy]

Good day all. We have an NEC 2400 with a Q-SIG card to extension dial to the Call Manager. Everything works great except after awhile the "line" locks up and trying to call the other extensions gives a busy signal. Resetting either the NEC card or the router clears the problem for a short time and the trouble reoccurs. Please let me know if anyone has any ideas of what we check out.
Thanks for your help in advance.
Frank

Frank. City of Cape Coral, Florida

 

[whykap]

Are there crc errors on the PRI? is it a possibility that there are too many errors and it shuts down eventually?

Also this could be a Qsig issue between the two systems. Temporarily change it from qsig to NI2 and see if the issue goes away.