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Stripping or modifying digits
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Thane   Offline
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Stripping or modifying digits
Mar 26th, 2020 at 7:11am
 
Good morning all!
Hope all are in good health.

Thought I would ask for some help as I cannot seem to find a method to achieve what is required as we are now routing to the Cisco Call Manager side of the house.

We have had a large bump in people teleworking this week, and they have been call forwarding (*72) their phones to external numbers.

The problem we have is that when these extensions are called from an external number the externally calling digits are forwarded, not the digits from the call forwarded number and it gets rejected when it goes to the Cisco Call Manager side of the house, as the DISA trunks will not accept any numbers that are not DID to our switch.

For example:  External number 555-555-5555 calls our forwarded number 111-1111 that forwards to 333-333-3333.  The 15555555555 is forwarded through the Cisco trunks to 3333333333 and rejected.

Is there a way to get the call forwarded extension number (1111111 above example) to be forwarded instead of the externally calling numbers (5555555555 above)?

I hopefully I achieved making myself understandable.

Thanks and wash your hands!
 
 
 
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don   Offline
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Re: Stripping or modifying digits
Reply #1 - Mar 27th, 2020 at 7:14am
 
Thane:

Not familiar with Cisco call manager but this issue seems to be same as a cfw to voice mail whereby voice mail needs the (ocn) original called number or something called last number called info to complete the call. Do you know if the cfw number is being sent to Cisco Manager? What is the config on the trunks between Cisco and your switch with he cfw number.

 
 
 
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Thane   Offline
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Re: Stripping or modifying digits
Reply #2 - Mar 27th, 2020 at 8:18am
 
Thanks Don!

Sort of the opposite of the VM.  The Cisco side of the house tells me they are receiving the external calling number that is calling the call forwarded number, when they need the number that is call forwarded to them instead.

Here is config info:

>findref clli cisco_cm_1
COMMON_LANGUAGE_NAME value CISCO_CM_1 is found in the following tuples:
------------------------------------------------------------------

TAB   CLLI
      CISCO_CM_1 198 24 VOIPPRI

TAB   TRKGRP
      CISCO_CM_1 PRA 0 NPDGP NCRT DSEQ N (ISDN 74) $ $

TAB   AVRTDATA
      101 T1 Y Y (S CISCO_CM_1 N N 0 N N) $

TAB   CLLIMTCE
      CISCO_CM_1 CISCO_ 5 10 15 NSS 0 0 N N (23)

TAB   OFRT
      571 (N D CISCO_CM_2 3 568 N) (N D CISCO_CM_3 3 568 N)
         (N D CISCO_CM_4 3 568 N) (N D CISCO_CM_5 3 568 N)
         (N D CISCO_CM_6 3 568 N) (N D CISCO_CM7 3 568 N)
         (N D CISCO_CM_1 3 568 N) (T OFRT 581) $ $

TAB   IBNRTE
      51 (ISA N N N CISCO_CM_1 N PUB NONE N N 0) $ $
      70 (ISA N N N CISCO_CM_1 N PUB NONE N N 0)
         (ISA N N N CISCO_CM_2 N PUB NONE N N 0)
         (ISA N N N CISCO_CM_3 N PUB NONE N N 0)
         (ISA N N N CISCO_CM_4 N PUB NONE N N 0)
         (ISA N N N CISCO_CM_5 N PUB NONE N N 0) (CND ALWAYS ST 71) $ $

TAB   TRKSGRP
      CISCO_CM_1 0 DS1SIG ISDN 8 12 87Q931 2 N STAND NETWORK PT_PT USER N UNEQ
         25 N DEFAULT LTC 19 0 24 64K HDLC $ $

TAB   TRKMEM
      CISCO_CM_1 1 0 LTC 19 0 1
      CISCO_CM_1 2 0 LTC 19 0 2
      CISCO_CM_1 3 0 LTC 19 0 3
      CISCO_CM_1 4 0 LTC 19 0 4
      CISCO_CM_1 5 0 LTC 19 0 5
      CISCO_CM_1 6 0 LTC 19 0 6
      CISCO_CM_1 7 0 LTC 19 0 7
      CISCO_CM_1 8 0 LTC 19 0 8
      CISCO_CM_1 9 0 LTC 19 0 9
      CISCO_CM_1 10 0 LTC 19 0 10
      CISCO_CM_1 11 0 LTC 19 0 11
      CISCO_CM_1 12 0 LTC 19 0 12
      CISCO_CM_1 13 0 LTC 19 0 13
      CISCO_CM_1 14 0 LTC 19 0 14
      CISCO_CM_1 15 0 LTC 19 0 15
      CISCO_CM_1 16 0 LTC 19 0 16
      CISCO_CM_1 17 0 LTC 19 0 17
      CISCO_CM_1 18 0 LTC 19 0 18
      CISCO_CM_1 19 0 LTC 19 0 19
      CISCO_CM_1 20 0 LTC 19 0 20
      CISCO_CM_1 21 0 LTC 19 0 21
      CISCO_CM_1 22 0 LTC 19 0 22
      CISCO_CM_1 23 0 LTC 19 0 23

TAB   TRKNAME
      198 CISCO_CM_1

TAB   LTMAP
      ISDN 74 CLLI CISCO_CM_1 (TEI 0) $

-----------------------------------------
Total number of references found:  33

>table ltdef
TABLE: LTDEF
>pos isdn 74
  ISDN   74    B
PRA 23 NTNAPRI V1 NIL (NOPMD ) $

>table ltcalls
TABLE: LTCALLS
>pos isdn 74 pub
  ISDN   74    PUB
                                        RTEREF  IBNRTE   42

TABLE: IBNRTE
>pos 42
  42                      (   RX           SITE 0 199     0             $)$
 
 
 
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don   Offline
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Re: Stripping or modifying digits
Reply #3 - Mar 27th, 2020 at 9:42am
 
Thane:

Do you have the pri ocn setup in table isdnparm?This will send the ocn parm to cisco.Hopefully they will know what to do with it.

Don


 
 
 
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Thane   Offline
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Re: Stripping or modifying digits
Reply #4 - Mar 27th, 2020 at 5:45pm
 
Thanks again Don.  Table ISDNPARM in an empty table unfortunately.
 
 
 
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don   Offline
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Re: Stripping or modifying digits
Reply #5 - Mar 27th, 2020 at 6:14pm
 
Thane:
Thats ok , You can datafill an entry in isdnparm, call it maybe cisco and add ocn datafill to it. Then you add the cisco index in table trksgrp.  So now when a call is call forwarded over the pri it will send the ocn ( original called number) element in the setup message .
 
 
 
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Re: Stripping or modifying digits
Reply #6 - Mar 30th, 2020 at 8:49pm
 
Don, that's pretty cool, thank you!!!

Fwiw, here's the rest of these ISDNPARM options (at least for our SN09, DMS100) if anyone else interested (like i was) in other options that could be added in addition to the OCN...

>zz pid_type
   TYPE PID_TYPE                          STRING RANGE
        'RNN'                                    2
        'RGN'                                    3
        'CN'                                     6
        'OCN'                                    7
        'IRQ'                                    8
        'FAC'                                    9
        'DIE'                                    18
        'CGS'                                    20
        'CDS'                                    21
        'LLC'                                    22
        'HLC'                                    23
        'SH5'                                    30
        'SH6'                                    31
        'SH7'                                    32
        'UNK'                                    33
   END STRING RANGE
 
 
 
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Thane   Offline
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Re: Stripping or modifying digits
Reply #7 - Mar 31st, 2020 at 9:52am
 
Thanks for all this great information!  Time to start researching isdnparm parameters...
 
 
 
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don   Offline
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Re: Stripping or modifying digits
Reply #8 - Mar 31st, 2020 at 11:10am
 
Thane :

It seems i misdirected you on this. As you have trksgrp setup for default this should mean the OCN by default is being sent to the cisco pri . You would need to capture a q931 to verify this.
 
 
 
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