This is the output from the CLI when I call the ZAP card
---------------------------------
Connected to Asterisk 1.4.1 currently running on asterisk (pid = 5587)
Verbosity is at least 3
    -- Starting simple switch on 'Zap/2-1'
  == Starting Zap/2-1 at DID_trunk_3,s,1 failed so falling back to exten 's'
  == Starting Zap/2-1 at DID_trunk_3,s,1 still failed so falling back to context 'default'
[Apr 16 09:13:13] WARNING[5657]: pbx.c:2432 __ast_pbx_run: Channel 'Zap/2-1' sent into invalid extension 's' in context 'default', but no invalid handler
    -- Hungup 'Zap/2-1'
----------------------------------
This is What I have defined in extensions.conf

[DID_trunk_1]
include = default
exten = _X.,1,Goto(default|601|1)
exten = s,1,Goto(default|601|1)

[DID_trunk_2]
include = default
exten = _X.,1,Goto(default|602|1)
exten = s,1,Goto(default|602|1)