here i am again asking your help. this time its about DTMF to PSTN.
we have TE110P connected to Rhino CB w/ 8FXO and 16 FXS
we have GXP2000, BT200,Atcom320,N80i and Polycom501.
before, that was long time ago these phones work perfectly when it comes to DTMF.
One day after playing echocancel,echotraining, rxgain and txgain hoping to remove echo. i noticed that the n80i and polycom501 will not work when it comes to DTMF while other phone still the same.
as im more affected with echo so i set aside this DTMF issue.
and after solving echo with HPEC and of course w/ the help of sir baconbuttie(discover bug in hpec) and sir ironhelix(for upgrade tar.gz)
i am now back to this DTMF issue.
one thing i have notice when doing a call to pstn using either n810i or polycom501 i can hear the called party saying “hello…hello” and hangup the phone as he/she think no one is in the other side, as i am not audible.
also i tried calling those phones with DXD or AA that ask to press a key to connect to a certain extension and when i do so nothing happen unitl my call connected to operator and the operator again does’nt hear me.
however, when i call our customized ivr(where call was placed in LAN) from N80i/poly to Asterisk the DTMF works well.
in contrary i use BT200,GXP2000 and Atcon320 calling pstn(which all phone has RFC2833) everything goes well, the DTMF is fine and no echo.
i have played my sip.conf by changing dtmfmode from inband to rfc2833
and also in zapata.conf as relaxdtmf from “yes” to 'no".
do you have the best DTMF tutorial or any help
once again Thank you very much