[cisco-voip] 5 digit and 10 digit dialing

[Brian Meade]

Seems like I have this discussion with a customer at least once a month.

Sometimes I think some of these cloud-providers offering no off-hook
dialing have done it right, but I'm an off-hook dialer myself.

On Thu, Apr 12, 2018 at 1:43 PM, Anthony Holloway <
avholloway+cisco-voip at gmail.com> wrote:

> It's surprising to me, how many people I hear these days, asking to remove
> the PSTN access code (typically a 9 in the US), but then still want intra-
> and inter-site abbreviated dialing habits to be supported.  The usual
> defense is: "I don't have to dial a 9 on my cell phone."  Though, these
> same people admit that they cannot 4 digit dial on their cell phones either.
>
> I have one customer who was talked into a design by someone else, and just
> the opposite of OP, they have to dial a "1" for all calls, local and
> national.  And so, none of the intra- or inter-site abbreviated dialing
> habits start with a 1.
>
> So, in a way, they're still dialing a PSTN access code, it just happens to
> be "1" and not "9".
>
> Oh, and they cannot have a 0 operator extension, because of international
> dialing habits starting with 011.
>
> That's not great, but I get it.  People ask for things from an ignorant
> place, and it's our jobs as experts to inform and lead design discussions.
>
> I think everyone should avoid inter-digit timeouts (aka post dial delay,
> aka T.302, aka "Why isn't my call working?") in their design, and Cisco has
> now given us the glorious check box for translation patterns: "Do Not Wait
> For Interdigit Timeout On Subsequent Hops" to help do just that.  Now, in
> variable length numbering plans within E164, it's not un-avoidable, but in
> the US and for intra- and inter-site dialing, it is avoidable.
>
> Actually, it's not like what I think is the best design solution just
> because I think it is, but rather, it's actually a published design
> practice from Cisco in their Preferred Architecture for Enterprise
> Collaboration 11.6:
>
> *"Starting the design process with an overview of all dialing habits makes
> sure that overlaps between any two dialing habits leading to inter-digit
> timeouts are detected and can be resolved before starting the dial plan
> deployment. Avoiding overlaps with any other (typically on-net) dialing
> habit is the key reason for using a PSTN access code (typically 9 in the
> US, as shown above)."*
>
> Source: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/
> Collaboration/enterprise/11x/116/collbcvd/control.html
>
> To answer the OP question more directly: well, it depends.
>
> The timer expiring has nothing to do with the pattern that was matched.
> For example, if you had the following two Translation patterns as potential
> matches:
>
> 1XXX Urgent
> 135! Non-Urgent
>
> And you dialed 1350, you could not dial anymore digits after the 0, even
> though we've used the ! to indicate more digits could follow.  Furthermore,
> the pattern with UP on it, is not matched, because 135! has less potential
> matches (aka is the closest match).
>
> So, with that knowledge, and with what Brian said, you could do this:
>
> XXXX Non-Urgent - Used for intra-site abbreviated dialing - Uses a CSS
> that can only reach internal extensions
> [2-9]XX[2-9]XXXXXX Urgent - Used for US Local and National PSTN dialing -
> Uses CSS inheritence to match next hop RP for PSTN routing
>
> So if the user dialed 6120, then waits for the timer to expire, CUCM
> selects the XXXX non-urgent pattern.  Then, if the user dials 6125551212,
> CUCM selects the urgent pattern for PSTN and routes the call.
>
> In that way, your internal dialing uses one CSS, while your PSTN calls use
> another, and your internal dialing (which should be thought of as fast)
> will now have a post dial delay (default 15 seconds).
>
> Though, I must go back to the beginning of what I was saying, and say that
> I think you should review the documentation on dial plan design.  There are
> even two great sessions at Cisco Live every year on the topic, which you
> can watch for free right now:
>
> Enterprise Dial Plan Fundamentals - BRKUCC-2008
> <https://www.ciscolive.com/global/on-demand-library/?search=dial%20plan%20fundimentals&search.event=ciscoliveus2017#/session/1484348904036001WD7Q>
>
> Advanced Dial Plan Design for Unified Communications Networks - BRKUCC-3000
> <https://www.ciscolive.com/global/on-demand-library/?search=advanced%20dial%20plan&search.event=ciscoliveus2017#/session/1484348904069001Wggq>
>
> On Thu, Apr 12, 2018 at 10:00 AM Brian Meade <bmeade90 at vt.edu> wrote:
>
>> Can't you just add those partitions to the existing CSS and make sure
>> Urgent Priority isn't checked on the 5-digit extensions?
>>
>> On Thu, Apr 12, 2018 at 10:52 AM, Carlo Calabrese via cisco-voip <
>> cisco-voip at puck.nether.net> wrote:
>>
>>>   Users are doing 10 digit dialing so any calls local or long distance
>>> are just 10 digits.
>>> they also want to do 5 digit dialing to the cube next door. I have *XXXX
>>> XXXX*
>>> but is there a way to look for a dial pattern in a different partition
>>> after the inter-digit time out is reached.
>>>
>>> So they user would start dialing and if they only dial 5 digits and
>>> after the inter-digit timeout is reached, it would look at another CSS.
>>>
>>> Thanks.
>>>
>>> Carlo
>>>
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>>>
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>
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