There is a bug in the SPA50x/SPA51x latest firmware version 7.6.2SR6/7.6.2f. For examplefnc=sd;ext=4161500000 ,0123456@$PROXY;nme=TestThe SPA with version 7.6.2SR6 dials the number 4161500000 then waits 2 seconds and then sends DTMF begin '0' RTP pac...