Hi, I have a problem about musiconhold/playback command in the dial plan. Actually, I have the following dial plan for inbound call. [from-gateway] exten => 1234,1,Answer() exten => 1234,2,MusicOnHold(c1) exten => 1234,3,Hangup() When I using mobile to make call 1234, it works and I can hear music. (below is the log from CLI) -- Executing Answer("SIP/203.193.26.242-087233a8", "") -- Executing MusicOnHold("SIP/203.193.26.242-087233a8", "") -- Started music on hold, class 'c1', on channel 'SIP/203.193.26.242-087233a8' Aug 27 15:04:36 NOTICE[18840]: rtp.c:331 process_rfc3389: Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: 203.193.26.242 Then, I use a normal phone to make a call to 1234 thro' PSTN, I can't hear any music and CLI shows there is a looping. In the log below, it tries to play the music but somehow it stops to play and go back to answer to call again. It shows spawn extension (from-gateway,1234,2) exited .... It seems that there is a problem in this command. However, I can't find any hint in the message and even log. -- Executing Answer("SIP/203.193.26.242-08723500", "") in new stack -- Executing MusicOnHold("SIP/203.193.26.242-08723500", "c1") in new stack -- Started music on hold, class 'c1', on channel 'SIP/203.193.26.242-08723500' -- Stopped music on hold on SIP/203.193.26.242-08723500 == Spawn extension (from-gateway, 1234, 2) exited non-zero on 'SIP/203.193.26.242-08723500' -- Executing Answer("SIP/203.193.26.242-08728a10", "") in new stack -- Executing MusicOnHold("SIP/203.193.26.242-08728a10", "c1") in new stack -- Started music on hold, class 'c1', on channel 'SIP/203.193.26.242-08728a10' -- Stopped music on hold on SIP/203.193.26.242-08728a10 == Spawn extension (from-gateway, 1234, 2) exited non-zero on 'SIP/203.193.26.242-08728a10' -- Executing Answer("SIP/203.193.26.242-08723500", "") in new stack -- Executing MusicOnHold("SIP/203.193.26.242-08723500", "c1") in new stack -- Started music on hold, class 'c1', on channel 'SIP/203.193.26.242-08723500' -- Stopped music on hold on SIP/203.193.26.242-08723500 == Spawn extension (from-gateway,1234, 2) exited non-zero on 'SIP/203.193.26.242-08723500' Does anyone have the same problem as me? Anyone can suggest me a solution to solve it? Thanks.