I have a DTMF related question. I understand how to reap DTMF using Asterisk, and related application environments, for example, ARI. See as an example https://wiki.asterisk.org/wiki/display/AST/ARI+and+Channels%3A+Handling+DTMF.
While, sending DTMF over a landline phone is slow; I was wondering if there is anyway to send it faster over PSTN for applications using smartphone apps as the SIP UA, so that my PBX connected via a SIP trunk into an Asterisk PBX, can retrieve more information faster (e.g., retrieve a 40-digit DTMF quicker than 1 second). For starters, is it even possible? if so, how have you achieved it? My thinking is, "if fax can do this, there has to be other ways of using DTMF..."
Do common libraries like PJSIP allow this? What API calls are involved, if so?
Any insight into this is appreciated.
Thanks!
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