[cisco-voip] E164 routing loop

[Sreekanth]

Have you tried the 'huntstop' command on DP 200 so that the IOS stops
hunting for more dial-peers after matching DP 100 and DP 200?

On 14 August 2017 at 09:09, Brian Meade <bmeade90 at vt.edu> wrote:

> 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 <kiwi.voice at gmail.com> 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
>>
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>>
>>
>
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