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As a Telecommunications Engineer of some 35 years it would be my recommendation that both be folded into one section called Telephone Communications Tones. Along with references to Black, Blue and Red Boxes and Captain Crunch. 126.96.36.199 (talk) 14:36, 14 February 2012 (UTC)Laurin Cavender188.8.131.52 (talk) 14:36, 14 February 2012 (UTC)
Call-progress tone and Dual-tone multi-frequency signaling are things of different purpose and their usage does not coincide. For example, there are call-progress tones in public telephone networks of my country, but there is no DTMF. I am not willing to look for sources of American humor such as "Black, Blue and Red Boxes and Captain Crunch", but mixing call-progress tones with DTMF is impractical at least for certain parts of the world. Incnis Mrsi (talk) 17:05, 3 May 2012 (UTC)
As a Voice_over_IP software developer over the last 15 years I've had to work with Dual-tone multi-frequency signaling for both generation and detection on a number of different systems but, in developing these systems, this is technically very distinct from Call-progress tones (which work quite differently in VOIP systems than in traditional telephony). Therefore, to me at least, it makes good sense to keep the different sections in their current form. 184.108.40.206 (talk) 10:18, 1 November 2013 (UTC)