Router: Cisco 3725
IOS Version: 12.4(10a)
IOS image loaded: "flash:c3725-spservicesk9-mz.124-10a.bin"
Sometimes the E1 doesn't put channels in idle status, so it doesn't stay ready to receive next call.
I saw a lot of good information in CCO doc - E1 R2 Signaling Configuration and Troubleshooting, but the IOS version running in 3725 router do not have the same debugs from doc at URL:
The carrier told us: therea are a bit ABCD error when the call has been diconnected (here in Brazil only bits CD matter to signaling).
When carrier sends "CLEAR_FORWARD" the router should be answer with CD=01 bits, but it never happens. In vision of carrier (Voice Service Provider).
Anybody knows how can I see the E1 signaling bits using IOS 12.4(10a)?