my zapata.conf:

[channels]
echocancel=no
echocancelwhenbridged=no
echotraining=400
usecallerid=yes 
;callprogress=yes
busydetect=yes

context=MainMenu
signalling=fxs_ks 
group = 1
channel => 1


my tonezone i created for costa rica:

        { 34, "cr", "Costa Rica", { 1200, 4900 },
          {
                  { ZT_TONE_DIALTONE, "450" },
                  { ZT_TONE_BUSY, "450/330,0/330,0" },
                  { ZT_TONE_RINGTONE, "450/1200,0/4900,0" },
                  { ZT_TONE_CONGESTION, "450/330,0/330,0" },
          },
        },

Based on data taken from itu.int seen here:

Costa Rica   
 Busy tone -    450   0.33 on 0.33 off 
 Congestion tone -    450   0.33 on 0.33 off 
 Dial tone -    450   continuous 
 Ringing tone -    450   1.2 on 4.9 off 
 Warning tone - operator intervening    425   0.17 on 0.17 off 0.5 on 0.17 off 
 Call waiting tone -    450   0.15 on 0.15 off 0.15 on 8.0 off 


mainMenu context that the call ends up in:

exten => s,1,Answer
exten => s,2,SetVar(LANG=es)
exten => s,3,SetVar(COUNTER=0)
exten => s,4,Wait(2)
exten => s,5,NoOp
exten => s,6,Playtones(!950/330,!1400/330,!1800/330,0) 
exten => s,7,Dial(SIP/103,30,tr)