my upstream sip provider runs tekelec and informed me tekelec doesnt play nicely with rfc2833 dtmfmode implemented by asterisk. So I am running inband. It still didnt work, so i tested just from phone to phone in office here. like:
[phone A]----[asterisk]-----[phone B]
If phone A calls phone B, phone B (and asterisk cannot hear any dtmf
tones by phone A); however phone A can hear(along with asterisk) all the
dtmf tones that phone B generates. If I switch roles so that phone B calls phone A the opposite happens; for some reason the caller can never send dtmf to the called person.
Any ideas on this?