[cisco-voip] 911 call timing question

[Wes Sisk]

Hi Tim,

Several questions, so here's my first shot at answers -

911 - some people have chosen to use 9-911 to address this situation.  
if you want to have 9-1-1 delay for <interdigit_timeout> you can create 
a dummy overlapping number such as 9111.  So long as both patterns are 
equal priority (do not check the urgent priority flag), Callmanager will 
receive 9-1-1 and then wait for <interdigittimeout> seconds before 
routing the call.  As you are using CER, you would need to create the 
dummy overlap in the same partition with your 911 CTI Route point that 
CER registers.

To trace the calls to see where a call would go IF it were placed form a 
specific device/line use DNA - Dialed Number Analyzer
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_user_guide_book09186a00801e8b62.html

If you want to track down a call that has already been placed -
If you are using MGCP gateways, this can all be done at the 
callmanager.  If the call was terminated after it went into the fully 
connected state, then the number will show up in CDR records.  You may 
need to enable the CM service parameter "log calls with zero duration" 
to see some calls.

if you are using h323 gateways, then the specific exit interface is not 
exposed to CM, it is only available at the router itself in "sh call 
history voice" or in CDRs collected via syslog or SNMP from the router 
itself.

/Wes



Tim Reimers wrote:

> We are having trouble with people calling 911 by accident-
>  
> Typically, it's because one of the area codes we dial a lot in this 
> district is 919 -
> So, people hit 9 to get out, then 1, and then I guess get dyslexic 
> momentarily, and hit another 1 instead of the second 9  (9,1-919)
>  
> What I'd like to do is find a way to set it up so that the system 
> traps that fourth digit, and realises that there's NOT actually a 911 
> call in progress, and does what it should with the call, either 
> process it, or provide an error tone for digits that make no sense...
>  
> We are running
> Two call managers, running 3.3.4 (soon to be 4.1 )
> An H.323 gateway connecting two PRIs (totalling 30 channels)
> 1760 routers connected to analog lines at each school.
> Cisco Emergency Responder
>  
> btw- One other related thing I'd like know:
>  
> How can I track (logfile) the call routing experienced by a 911 call?
> I'd like to verify that it goes out the right gateway- and know what 
> port that was eg, 1/1/1 or 1/1/0, etc...that would allow me to know 
> what the phone number was that 911EOC saw on their displays...
>  
> Tim
>  
>
> Tim Reimers
> Network Administrator
> Asheville City Schools ITT
> 85 Mountain Street
> Asheville, NC 28802
>
> tim.reimers(at)asheville(dot)k12(dot)nc(dot)us
> 828-350-6180
>
>
>
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