Thank you for your quick response,
I am going to search that zimlet and then i will deploy it. When i do url based debug i am getting this error.
HTTP ERROR 500
Problem accessing /service/zimlet/com_zimbra_asterisk/asterisk.jsp. Reason:
/com_zimbra_asterisk/asterisk.jsp(19,48) PWC6117: File "/WEB INF/zimbra.tld" not found.
but this zimbra.tld file is already existing there. I am not good at coding how can i resolve this issue.