zabbix cant delete usermedia via API

[phl4kx]

Hi all, I like to delete usermedia (mediaid=46) via API in zabbix 1.9.8 but I cant, the API give me result:

( [jsonrpc] => 2.0 [result] => stdClass Object ( [mediaids] => Array ( [0] => stdClass Object ( [mediaid] => 46 ) ) ) [id] => 5 )

but the mediaid=46 not disappear from the GUI Zabbix

please some help

Thanks