Tone tones not recognized

[tritch]

It's called touch tones (DTMF). You'll need to try another DTMF setting to resolve this issue.....

In the HT702 manual, there are 3 possible DTMF settings:

1) DTMF in-audio
2) DTMF via RTP (RFC2833)
3) DTMF via SIP INFO

Option 2 (RFC2833) is the gold standard and should work under normal circumstances. If not, then you'll have to try option 1 or 3.

If it's Voipo's device, then you will have to open a support ticket with them to change this setting for you. If it's your device (BYOD), you can change the setting yourself by logging into the device (DTMF Settings are in FXS portX/ProfileX page).