Inbound calls failing

[harresh123]

We all of a sudden started seeing inbound calls from carrier failing with Requested channel not available. On testing further we see that the carrier is trying to fork calls on a channel that is already pre-occupied and hence the cisco returns "Requested circuit/channel not available" to the carrier. There is clearly a miss-match in bearer channel status on the gateway vs the carrier. I am not sure what could cause this all of a sudden. We unchecked "inhibhit restart at PRI initialiazation" but to no avail. The only thing that seems to clear up this issue for sometime is a controller reset or a mgcp restart. Any ideas on what else could be causing this?

[Ratheesh Kumar]

Hi there

Seen some cases where "Inhibit restarts at PRI initialization" didn't work in first place.

• Unchecked this option and Save
• Reset the GW
• Reload the GW

 Still Not working,

• Delete the MGCP GW from CUCM
• Remove the mgcp/ccm configs
• Reload the GW
• Add the GW back into CUCM and make sure to uncheck "Inhibit restarts at PRI initialization" option before adding

Hope this Helps

Cheers
Rath!
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[Dennis Mink]

Is this a fractional E1? (ISDN 10, 20)?

[HARIS_HUSSAIN]

Try below
In Interface Serial: of PRI change the Isb bchan number.
isdn bchan-number-order {ascending | descending}.

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Thanks,
Haris

[mariodavila1]

We are expexriencing similar issues. Were you able to find a solution or did any of the replies help you fix the issues?

Seems like it "times out" and returns to normal service after a while. I suspect we are having an issue with the carrier.

Not sure why unchecking the "Inhibit restarts at PRI initialization" will resolve this.....

I guess it's worth a try but I don't like guessing...

[harresh123]

We had the carrier turn off the B-channel service messaging on their side.