[Freeswitch-users] Setting "accountcode" Dynamically

Regarding the "accountcode" channel variable in FS: http://wiki.freeswitch.org/wiki/Variable_accountcode. Is there any example or method of dynamically setting this accountcode for a the call has already been established? This would apply for a case where a call is received and the callee would like to set the accountcode during the conversation. Thanks, Jerry