[Asterisk-Users] one extension goes straight to voicemail, others don't

[taran]

i have one extension going straight to voicemail, while others that are 
configured identically don't, so i don't think it's an overall config 
problem. nor do i think it's a callerID problem. maybe it's an enduser 
operation that i can't find documentation on?

che*CLI>
     -- Starting simple switch on 'Zap/48-1'
     -- Executing Macro("Zap/48-1", "stdexten|264|internal") in new stack
     -- Executing GotoIf("Zap/48-1", "0?tr|1:2") in new stack
     -- Goto (macro-stdexten,s,2)
     -- Executing GotoIf("Zap/48-1", "1?sd|1:3") in new stack
     -- Goto (macro-stdexten,sd,1)
     -- Executing Dial("Zap/48-1", "Zap/g1/12142578181|20|") in new stack
     -- Called g1/12142578181
     -- Channel 0/1, span 1 got hangup
Sep  6 13:55:27 WARNING[20411]: app_dial.c:405 wait_for_answer: Unable 
to forward voice
     -- Hungup 'Zap/1-1'
   == No one is available to answer at this time
     -- Executing VoiceMail("Zap/48-1", "u264") in new stack
     -- Playing 'voicemail/default/264/unavail' (language 'en')
     -- Playing 'vm-intro' (language 'en')
   == Spawn extension (macro-stdexten, sd, 2) exited non-zero on 
'Zap/48-1' in macro 'stdexten'
   == Spawn extension (fxs_internal, 264, 1) exited non-zero on 'Zap/48-1'
     -- Hungup 'Zap/48-1'

any help would be appreciated...

thanks,

   .taran