asterisk users - Jun 2006 - Problem when i call to asterisk from traditional phones

Hi , when i call to asterisk from a Skype or Voipbuster phone all the
extensios runs good , and i can stablish ZAP to SIP comunication, also
i can do a SIP to ZAP call , but when i call from a traditional
analogic phone i get these error:

chan_sip.c:694 retrans_pkt: Maximum
retries exceeded on call 0afcadc1422e63800115943201a885fb@192.168.1.44
for seqno 102 (Critical Request)

What i can do ?

Asterisk Box has 192.168.1.44

My extensions file:

[entrada]

exten => s,1,Wait,10
exten => s,2,Answer
exten => s,3,Wait,1
exten => s,4,Playback(outputfile)
exten => s,5,Wait,1

exten => 1,1,Dial(SIP/201@192.168.1.33,10,Tt)
exten => 2,1,Dial(SIP/203@192.168.1.4,10,Tt)



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