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PRI RAI Message

Hi All,


I need some help please, we have a client with a telco PRI, the telco had a failure last week but has since resolved but ever since then when we make an outbound call, the call lasts for about 2-3 seconds and then shuts itself down(inbound is fine), not sure what else to check as this configuration has been running for more than 6 years, PRI is registered to CUCM via MGCP, I have attached debug isdn q931 error on a failed call. Telco has tested with a trend device and are able to make calls successfully from the PRI. I can attach the configuration if required.




10 Replies 10

Georg Pauwen
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VIP Master



try and toggle the CRC4 settings on the controller interface (Framing NO-CRC4/Framing-CRC4)...


RAI means Remote Alarm Indication by the way, usually indicating a problem at the remote end.


Which isdn switch-type do you have configured for your PRI ?



Thanks for your reply, we have tried that but no joy, what i did notice now is that the PRI still flaps with that message even though no outbound calls are being routed through it, I am pretty sure this is telco related but they have cleared their side and the fact that they can dial out when they connect to the PRI is even more frustrating. PRI Configuration is below and log error.


interface Serial0/0/1:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bind-l3 ccm-manager
 isdn send-alerting
 isdn sending-complete
 no cdp enable

Jul 24 08:11:14.817: %CONTROLLER-5-UPDOWN: Controller E1 0/0/1, changed state to down (RAI detected)
Jul 24 08:11:15.065: %MARS_NETCLK-3-HOLDOVER: Entering Holdover for Controller E1 0/0/1
Jul 24 08:11:16.817: %LINK-3-UPDOWN: Interface Serial0/0/1:15, changed state to down
Jul 24 08:11:18.817: %CONTROLLER-5-UPDOWN: Controller E1 0/0/1, changed state to up
Jul 24 08:11:20.817: %LINK-3-UPDOWN: Interface Serial0/0/1:15, changed state to up
Jul 24 08:11:21.317: %MARS_NETCLK-3-HOLDOVER: Exiting Holdover for Controller E1 0/0/1