[cisco-voip] MWI stays on without messages...even after resynch

[Wes Sisk]

Thinking out loud. Helps me and may trigger something for you.

Unity Connection sends MWI message to CUCM.  I *think* CUCM initiates a 
call from the MWI Off number.  It *should* use the CSS of the MWI Off DN.
Q1: In DNA how does a call route using the CSS assigned to the MWI Off 
Number?

I'm 100% clear on the SIP MWI implementation so it could use the CM 
service parameter "Message Waiting Indicator Inbound Calling Search Space".
Q2: What is configured here?
Q3: Test this CSS in DNA?


It should be possible to get a bit of clarification on what is 
happening.  In Q.SIG MWI is a call to the DN with special bearer 
capability and facility APDU).

  Feb 18 16:44:33.610 CST: ISDN Se1/0:23 Q931: RX <- SETUP pd = 8
  callref = 0x1201
      Sending Complete
      Bearer Capability i = 0xA880
          Standard = ISO/IEC
          Transer Capability = Unrestricted Digital
          Transfer Mode = Circuit
          Transfer Rate = Packet - not specified
      Channel ID i = 0xAC
      Facility i = 
0x9FAA068001008201008B0102A12402020D00020151301BA5090A0104120438383032
  0A 0101A10BA5090A0104120433313030
      Calling Party Number i = 0xC9, '3100'
          Plan:Private, Type:Subscriber(local)
      Called Party Number i = 0xC9, '8802'
          Plan:Private, Type:Subscriber(local)

Using raw data as an example:
0x9FAA06800100820100A20B02020D0030050201510500
Starting from A2(APDU type):
A2 Rose = Return result
0B length = 11
02     integer
02     length = 2
0D    13*256
00
30 SEQUENCE
05 length = 5
02 integer
01 length = 1
51 Operatin value = 81 (MWI OFF)
If the operation value is 80, then it is for MWI ON.


The important thing for you is the nature of the call - it is a call 
with the called party set to the line that should set (or clear) MWI.  
Either read the CM SDI traces looking for this call or enable CDR for 
zero duration calls and check CDR's to see if this call is being 
attempted and what is happening to it.

If you cannot find a call to the affected DN then it's failing in UC or 
in the UC to CUCM integration.

Hope this helps,
Wes




On 8/12/2011 4:18 PM, Wellnitz, Erick A. wrote:
>
> Okay…here’s an odd one.  I didn’t design the topology and we can’t 
> change it without some serious political battles.
>
> Nortel Option 11C -----QSIG----Cisco  2821 with 12.4(24).T4 
> -------MGCP----CUCM 8.0(3) ------SIP -------Unity Connection 8.0(3)
>
> Remote 
> Site-----------------------------------------------------------------------Central 
> Site------------------------Remote Site
>
> (yeah, I know)
>
> MWI fails to synch with two users.  Media stays local as it should. 
>   Latency is  averaging about 60ms round trip.
>
> Connection is set up per the integration guide.   I’m not familiar 
> with Nortel configurations but our Nortel person tells me these two 
> are identical to everyone else.  Routing in CM checks out via DNA.  
> Resynch of MWI doesn’t solve it.  UCONN shows the MWI for both users 
> as ‘off’.  Mailboxes are empty.
>
> I’m pretty much throwing things against the wall to see if they stick 
> at this point.
>
> *ERICK A. WELLNITZ *
> Network Engineer
> *Katten Muchin Rosenman LLP*
> 525 W. Monroe Street / Chicago, IL 60661-3693
> p / (312) 577-8041
> erick.wellnitz at kattenlaw.com <mailto:erick.wellnitz at kattenlaw.com>/ 
> www.kattenlaw.com <http://www.kattenlaw.com/>
>
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