we are using CUCM 7.1 with 2821 PRI MGCP gateway. all of the sudden PRI was disconnected and lost signaling and then came back up. I got this error from gateway:
005019: Mar 27 18:32:33.422 PDT: %CONTROLLER-5-UPDOWN: Controller T1 0/2/0, changed state to down (10 SES) 005020: Mar 27 18:32:33.426 PDT: ISDN Se0/2/0:23 **ERROR**: handle_l2d_srq_mail: Message tossed, state = 0 spoofing = 0 005021: Mar 27 18:32:33.430 PDT: ISDN Se0/2/0:23 Q931: L3_ShutDown: Shutting down ISDN Layer 3 005022: Mar 27 18:32:33.430 PDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/2/0:23, TEI 0 changed to down VGW-2821-Campus# 005023: Mar 27 18:32:33.438 PDT: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller T1 0/2/0 VGW-2821-Campus# 005024: Mar 27 18:32:35.422 PDT: %LINK-3-UPDOWN: Interface Serial0/2/0:23, changed state to down
I just want to know it's something related to CUCM/Gateway or service provider.
Typically the L2 ISDN status is shown as either MULTIPLE_FRAME_ESTABLISHED or TEI_ASSIGNED.
MULTIPLE_FRAME_ESTABLISHED indicates there is data link connectivity to the Telco ISDN switch. This is the state that you should see under normal operations. Any other state usually indicates a problem on the circuit. TEI_ASSIGNED indicates that the router has lost connectivity to the Telco switch switch.
From the log extract provided, the message '005022: Mar 27 18:32:33.430 PDT: %ISDN-6-LAYER2DOWN: Layer 2 for Interface Se0/2/0:23, TEI 0 changed to down' indicates that TEI status has changed and therefore indicates a problem with the Telco.
As the circuit is backup now if you run a 'show isdn status' command from the CLI you should see the status as MULTIPLE_FRAME_ESTABLISHED, if you get errors like the one above, verify the status, and like I said any other state other MULTIPLE_FRAME_ESTABLISHED usually indicates a problem on the circuit/telco.
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