[cisco-voip] Troubleshooting ISDN PRI alternating betweenTEI_ASSIGNED and AWAITING_ESTABLISHMENT

[Robert Kulagowski]

Rodrigo Villagran wrote:
> Hi,
> the problem must be that the D Channel is not available (some problem in the
> Telco), if you do the "sh controll E1" and the E1 is UP and without slips,
> then the problem is the D channel (L2 signalling), you could try to change
> from USER to NETWORK in protocol emulation, but the best is call the Telco
> to resolve the problem.

This sure looks like I've hit some sort of IOS bug.

Run the router with 12.4.10a - doesn't work.  Never gets out of 
TEI_ASSIGNED / AWAITING state.
Run the router with 12.4.4XC5 - works.  Can get inbound calls.

Same config, just changing the boot system flash command and reloading.

<sigh>