Some of the DTMF digits were not received or played out when SIP INFO method is used for sending the digit information.
Resolution: A bug was fixed related to using the branch ID in SIP packets when sending the INFO packets.This was fixed in firmware version (5.09.06).
This firmware along with instructions can be downloaded from our Web site at:
http://www.multitech.com/en_US/SUPPORT/Families/MultiVOIP/firmware