| 回復 11# ttmuskie 
 
 
 I use your same dialplan and give it a try.  There is no problem as you mentioned.  The message from CLI is as below:
 
 == Using SIP RTP CoS mark 5
 -- Executing [852350XXXXX@from-cmphone:1] Playback("SIP/cmphone-00000008", "demo-echotest") in new stack
 -- <SIP/cmphone-00000008> Playing 'demo-echotest.ulaw' (language 'en')    -- Executing [852350XXXXX@from-cmphone:2] Hangup("SIP/cmphone-00000008", "") in new stack
 == Spawn extension (from-cmphone, 852350XXXXX, 2) exited non-zero on 'SIP/cmphone-00000008'
 
 
 I can hear the playback before it hangs up.
 
 The only message difference that I got is marked in RED above.  Hence, I think you may put the codec allow = ulaw in the first place of general section in sip.conf and try again.
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