:::Missing calls to communicate a phone number seems within scope of the current article (deliberately missing calls to communicate information), but is there much to say about accidentally missed calls? If all we've got is a one line "it's when you miss a call, accidentally" and 99% of the article is then about the interesting abuses of that system, we're not doing the reader any favours if we present this article as being about both subjects. 
 :::I wasn't suggesting a full disambiguation page, just a hatnote of "This article is about deliberately missing calls to communicate information. For accidentally missed calls, see X." - where X is a suitable article for mentioning accidentally missed calls in passing (perhaps Telephone call#Placing a call).