Currently it is:

exten => _011.,1,answer
exten => _011.,n,Set(TIMEOUT(digit)=5)
exten => _011.,n,Set(TIMEOUT(response)=5)
exten => _011.,n,Dial(${TRUNK}/${EXTEN:${TRUNKMSD}})

I tried it without the answer, and without the timeouts as wel.

 -- Executing Answer("SIP/1001-40ab7390", "") in new stack
 -- Executing Set("SIP/1001-40ab7390", "TIMEOUT(digit)=5") in new stack
 -- Digit timeout set to 5
 -- Executing Set("SIP/1001-40ab7390", "TIMEOUT(response)=5") in new stack
 -- Response timeout set to 5
 -- Executing Dial("SIP/1001-40ab7390", "Zap/g1/0112") in new stack
 -- Called g1/0112