[asterisk-ss7] How to Use noanswer option in Playback

[M Jamshed]

Hi all.
How will i use noanswer option in playback application.
i have used like this
 exten = _X.,1,Playback(eng_notavail|noanswer)
But that particular voice prompt is not bieng played.
Her is my CLI

Starting SS7/1 at ss7,001255600001,1 failed so falling back to exten 's'
    -- Executing Playback("SS7/1", "eng_notavail|noanswer") in new stack
    -- Playing 'eng_notavail' (language '')
    -- Executing Hangup("SS7/1", "") in new stack
  == Spawn extension (ss7, s, 2) exited non-zero on 'SS7/1'

How will i solve this problem?
-- 

Regards
M Jamshed CC
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