[Freeswitch-dev] interdigit delays in RFC2833 DTMF

Hi, Can anyone help me understand the dtmf inter digit delays using Freeswitch and rfc2833. Im calling switch_core_session_send_dtmf_string() to send a few digits to an endpoint for retransmission over a 2 wire connection. Im using a couple of different endpoints to regenerate the DTMF, nn OBI110 and a linksys ATA. In both cases I don't see much of an inter digit pause, I can change the length of the digits with dtmf duration settings on freeswitch, but not the inter digit gap (space). Is this a function of Freeswitch,, or the terminating hardware? Thanks in Advance. Paul C.