Having just helped a large customer to work through a bunch of dial plan 
issues, I have a set of suggestions for how we display them.  I share them 
below to stimulate discussion...

Here's a screen shot <http://sipx-wiki.calivia.com/images/f/fd/DialPlan.png>  
(posted to the wiki because it's too big for the list) taken from an HTML 
mockup I did (the colors are a bit odd due to interactions between my personal 
color preferences and the stylesheet):

The improvements I'm suggesting are:
1.      The internal and external rules are separated and ordered 
independently.  This reflects how the rules really work - all rules that do not 
route to a gateway go in mappingrules.xml, and all that do route to a gateway 
go in fallbackrules.xml; each file is searched in order, mappingrules first - 
and fallbackrules is not used unless no other source of routing information 
(including aliases, registrations, mappingrules, etc) found a way to route the 
request. 
2.      I removed the Type column.  Mostly, I did this to make room, but I also 
think that it has little value in helping to read and understand an existing 
dial plan. 
3.      I moved Schedule next to Enabled/Disabled because it reads more 
naturally that way than having it widely separated. 
4.      I added annotations to the Enabled column (could be somewhere else or a 
column by itself) whenever an earlier rule masks (matches) all or part of the 
same pattern: 
⇑ when some numbers matched by this rule would be matched by an earlier rule
∅ when all numbers matched by this rule would be matched by an earlier rule 
(making this rule a no-op)
with tooltips when you hover over those annotations that tell you which earlier 
rule(s) overlap.


5.      I replaced Description (which says what the administrator thought the 
rule did) with three columns that display what it actually does: 
        Match
        Displays any fixed digits and the number of variable digits matched by 
the rule.
        Send
        Displays how the user part (phone number, usually) is modified by the 
rule on output.
        To
        Displays what gateway (for external) or service (for internal) the rule 
sends the request to.
        The existing Descriptions are probably valuable, but I'd move them to a 
tooltip that displays if you hover over the Name, or something along that line.
         
        I really like this in addition a mass disable/enable capability at the 
table level would be good.
         
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