You can do things like "no voice hunt unassigned-number" and "no voice hunt invalid-number" on IOS to keep it from trying more dial-peers.
On Sun, Aug 13, 2017 at 10:47 PM, Ki Wi <[email protected]> wrote: > Hi Group, > I have encountered this interesting problem on customer PBX. Didn't work > on live system for a long time but I am pretty sure this shouldn't be a > default behavior. > > When external PSTN caller calls an unassigned number in the DID range, > CUCM returns with error code 27 ( destination out of order). > > This causes the voice gateway to retry other dial-peers. > > There's 3 dial-peer which matches this e164 number. > 1)Dial-peer 100 goes CUCM (longest match, most specific) > 2)Dial-peer 200 goes CUCM (longest match, most specific) > 3)Dial-peer 300 goes to PSTN (the destination-pattern is .T) > > When dial-peer 100 and 200 "fails", the voice gateway will dial-out to > PSTN via dial-peer 300. Once again, PSTN route back to the customer VG. > This causes a routing loop and it can fills up all the available E1 > channels quickly. > > > *Just wondering if anyone encounter the following issue and have a > explanation to it? Just the engineering side of me want to get down to the > root cause. * > > The CUCM have "stop routing on unallocated number" turns off (false). Just > in case it matters. > > I tried to google around but can't seems to find any article that talks > about > 1) dial-peer behaviors (on voice gateway side) - on what error code will > cisco voice gateway retry other dial-peers? > 2) why CUCM returns error code 27? > > It's a managed service system so I'm unable to do a deep dive > troubleshooting. > > The current workaround introduced is to create a dial-peer 250 with a > higher preference that matches the DID range and block it. > > This means that incoming dialed number will match to 4 dial-peers (100, > 200, 250 and 300) > > After failing on 100 and 200, the call gets block on dial-peer 250. > > -- > Regards, > Ki Wi > > _______________________________________________ > cisco-voip mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/cisco-voip > >
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