I am trying to use a sip/hard phone - Polycom VVX500 If I try to use DTMF commands, they do work - but 30 seconds later, the call disconnects. - if I do not enter dtmf commands, seems to work fine - local connection using the 192.168 address - connected via gigabit ethernet switch - I also have the phone setup for callcentric - works fine there when I enter dtmf... asterisk -r Connected to Asterisk currently running on KC7DMF-1 (pid = 2689) Verbosity is at least 3 -- Executing [29627@radio-control:1] Answer("SIP/polycom-0863ce98", "") in new stack -- Executing [29627@radio-control:2] Playback("SIP/polycom-0863ce98", "rpt/node") in new stack -- <SIP/polycom-0863ce98> Playing 'rpt/node' (language 'en') -- Executing [29627@radio-control:3] Rpt("SIP/polycom-0863ce98", "29627|P") in new stack == Spawn extension (radio-control, 29627, 3) exited KEEPALIVE on 'SIP/polycom-0863ce98' -- <Zap/pseudo-1488761527> Playing 'rpt/goodafternoon' (language 'en') -- <Zap/pseudo-1488761527> Playing 'rpt/thetimeis' (language 'en') -- <Zap/pseudo-1488761527> Playing 'digits/5' (language 'en') -- <Zap/pseudo-1488761527> Playing 'digits/20' (language 'en') -- <Zap/pseudo-1488761527> Playing 'digits/8' (language 'en') -- <Zap/pseudo-1488761527> Playing 'digits/p-m' (language 'en') -- Hungup 'Zap/pseudo-1488761527' -- Hungup 'Zap/pseudo-1505109141' - sip.conf - [polycom] type=friend context=radio-control secret=secret-word-duh host=dynamic dtmfmode=rfc2833 ; Choices are inband, rfc2833, or info username=userpoly ; Username to use in INVITE until peer registers disallow=all allow=ulaw ; dtmfmode=inband only works with ulaw or alaw! progressinband=no ; Polycom phones don't work properly with "never" - extensions.conf - [radio-control] exten=29627,1,Answer exten=29627,n,Playback,rpt/node exten=29627,n,Rpt,29627|Pv found this: maybe related - I'm using a Polycom vvx 500 https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact...