void ast_set_callerid(struct ast_channel *chan, const char *callerid, const char *calleridname, const char *ani)
{
        if (callerid) {
                if (chan->cid.cid_num)
                        free(chan->cid.cid_num);
                if (ast_strlen_zero(callerid))
                        chan->cid.cid_num = NULL;
                else
                        chan->cid.cid_num = strdup(callerid);
        }
        if (calleridname) {
                if (chan->cid.cid_name)
                        free(chan->cid.cid_name);
                if (ast_strlen_zero(calleridname))
                        chan->cid.cid_name = NULL;
                else
                        chan->cid.cid_name = strdup(calleridname);
        }
        if (ani) {
                if (chan->cid.cid_ani)
                        free(chan->cid.cid_ani);
                if (ast_strlen_zero(ani))
                        chan->cid.cid_ani = NULL;
                else
                        chan->cid.cid_ani = strdup(ani);
        }
        if (chan->cdr)
                ast_cdr_setcid(chan->cdr, chan);
        manager_event(EVENT_FLAG_CALL, "Newcallerid",
                                "Channel: %s\r\n"
                                "Callerid: %s\r\n"
                                "CalleridName: %s\r\n"
                                "Uniqueid: %s\r\n",
                                chan->name, chan->cid.cid_num ?
                                chan->cid.cid_num : "<Unknown>",
                                chan->cid.cid_name ?
                                chan->cid.cid_name : "<Unknown>",
                                chan->uniqueid);
}