In * 1.4.0 and zaptel 1.4.1 have this problem:
-- Accepting call from '' to '3350708' on channel 0/1, span 1
-- Executing [3350708@from-zap:1] Goto("Zap/1-1", "mainmenu|s|1") in new stack
-- Goto (maintmenu,s,1)
-- Executing [s@mainmenu:1] Wait("Zap/1-1", "5") in new stack
-- Executing [s@mainmenu:2] Answer("Zap/1-1", "") in new stack
-- Executing [s@mainmenu:3] Set("Zap/1-1", "TIMEOUT(digit)=3") in new stack
-- Digit timeout set to 3
-- Executing [s@mainmenu:4] Set("Zap/1-1", "TIMEOUT(response)=10") in new stack
-- Response timeout set to 10
-- Executing [s@mainmenu:5] BackGround("Zap/1-1", "wellcome-liner") in new stack
-- Playing 'wellcome-liner' (language 'en')
[Mar 30 13:38:55] WARNING[14676]: pbx.c:2449 __ast_pbx_run: Invalid extension '3', but no rule 'i' in context 'mainmenu'
-- Hungup 'Zap/1-1'
caller from-zap line context goto to context mainmenu, wait 3 sec,answer, and Hangup line 
in 24 hours i have 20% hanguped incoming calls. card TE110.
euroisdn(pri=ccs,hdb3. no crc4)