Download CDR Wave File.

* Authentication required.
* Params:
* `"wavname"`, `"calldate"` are **required**.
* Notice:
* `"wavname"`, `"calldate"` should be in ***String*** format.
* `"wavname"`: Basename only without directory `"xxx-xxxxxx-xxx-xxxxx-xxxx.xxx.wav"`, e.g `"out-05355620760-101-20151208-102449-1449563089.106.wav"`.
* `calldate`: Date string formated as `"%Y-%m-%d"`, e.g. `"2016-09-01"`.
## CURL Example:

curl -X POST https://oim.pasifiktelekom.com.tr/en/api/pbx/cdr/wav/ \
-H 'Content-Type:application/json' -H 'accept:application/json' -H 'Authorization:XXXXXXXXXXXXXXXXXXXX' \
-d '{"wavname": "xxx-xxxxxx-xxx-xxxxx-xxxx.xxx.wav", "calldate": "2016-10-07"}'

For **Custom Search** by related file name accept regular expression like `grep` in shellscrip, it returns one file only or fail.

curl -X POST https://oim.pasifiktelekom.com.tr/en/api/pbx/cdr/wav/ \
-H 'Content-Type:application/json' -H 'accept:application/json' -H 'Authorization:XXXXXXXXXXXXXXXXXXXX' \
-d '{"wavname": "xxxx.xxx", "calldate": "2016-10-07"}'

GET /en/api/pbx/cdr/wav/?format=api
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "code": "200",
    "message": "OK"
}