Jun  9 11:54:36 ERROR[12127] chan_zap.c: Unknown signalling method 'pri_cpe'

Exists in /usr/src/asterisk/channels/chan_zap.c:

#ifdef ZAPATA_PRI
                                } else if (!strcasecmp(v->value, "pri_net")) {
                                        cur_radio = 0;
                                        cur_signalling = SIG_PRI;
                                        pritype = PRI_NETWORK;
                                } else if (!strcasecmp(v->value, "pri_cpe")) {
                                        cur_signalling = SIG_PRI;
                                        cur_radio = 0;
                                        pritype = PRI_CPE;