Wouldn’t it be better to allow the two FreeSWITCH boxes to talk directly to each other for calls between them? Eliminate the middle man and perhaps this and other problems disappear? https://freeswitch.org/confluence/display/FREESWITCH/IMT Bote From: Podrigal, Aron Sent: Thursday, 19 March, 2015 12:10 Subject: [Freeswitch-users] DTMF missing digits I am experiencing problems with sonus dtmf. I tried setting different parameters related to the RTP BUGS listed in switch_types.h but it did not seem to fix the problem. I have freeswitch ----> [carrier(sonus), ...] -----> freeswitch freeswitch sends the following digits to our carrier, and is received by the other end (also a freeswitch) missing the digits marked in black. pcap shows the missing digits as being part of the previous packet, so two 1's becomes one 1 with the duration sum of two. 1 - 1 - 2 - 1 - 1 - # What are the relevant parameters I should set?