[Users] openser+asterisk+voicemail password

Hi iam integrating with asterisk voice mail with Openser when we are creating openser views with asterisk the secret going to be Binary(0);, how can i change to numeric ? why i need is, take example If the user Phone logged in and the user have person voicemessage box he only can access his voice messages, when he dial secret If not any one can come and access voice message by dialing access number. with the config seen in the examples, person can dial *98 and hear all the messages and delete too. so for the security reason, how can i change the secret, iam trying to alter the table, but its say;s in view mode. any suggestions. Ra,