"error": [{ "code": 404, "message": "Request does not match any route."}] error magento1.9

Question

for custom get api request i am getting "Request does not match any route." error

api.xml

<route_entity>
    <route>/servicebms/outgoingcall/:k_number/:agent_number/:customer_number/:caller_id/:created_time</route>
    <action_type>entity</action_type>
</route_entity>

Here is the url

http://15.206.238.137/api/rest/servicebms/outgoingcall/

and how to add authentacation key, x-api-key in magento