I’ve been getting complaints lately that callers to my IVR are pressing a digit once but the system is responding as if they pressed it twice (once for each of two consecutive menus). I’m using an AGI script and logging all DTMF entries – and to the script, at least, it looks like the digit is being pressed twice. The TN being called is a VOIP number (provided by Flowroute) and being forwarded via SIP to my Astersisk server 126.96.36.199. The dtmfmode is set to rfc28333 in sip.conf.
The first time this happened, I figured the caller pressed the number twice without realizing it. It’s happening to too many people for that to be plausible anymore. I also experienced it once myself, months ago, when I entered my tn as 1234567890 and had it read back to me as 1122334455.
Can anyone give me some pointers where to start troubleshooting? Can overloading a system cause such an error?