call_flow - is the call flow created in the portal you create to tell the number how to routefax - if set to yes, the number will be a fax numberchannel_group - if you have a virtual PRI or channel group, pass the id numbervoicemail_inbox_id - if you have a voicemail you want this number to default to, pass it herecnam - if you want caller id name to be passed (extra charge) enable this heresms_post_url - Set an SMS URL specific to a phone number. This will override the account-wide SMS URLcall_post_url - The HTTP/HTTPS URL to call todelivery_notification_url - Set the DLR notification URL for a phone number