It was typo error, I mean it Obi202, not as I mentined Obi203 sorry for that. I have corrected the original post.
I Changed the SP3 inboundcallroute to (ph) and dialed the SP3 extension using Sipdroid. Pressed the digits and I can hear them on Phone. Is it mean DTMF is not issue?
So revert to original issue, what inboundcallroute is required to call from Sipdroid to SP3 and dial outside number using obiline (PSTN) line