ftmod_isdn: OpenZAP -> FreeTDM API updates.

Store call CRV in caller_data.call_reference and use call private to hold the
FreeTDM channel object.

Remove isdn_data->channels_{local,remote,outbound}_crv arrays.

Allow (and force) inbound call state transition DIALTONE -> DOWN for
incoming RELEASE COMPLETE messages in NT mode.

Dialtone in NT mode works, everything else needs more testing.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

libs/freetdm/src/ftmod/ftmod_isdn/ftmod_isdn.h

@@ -67,9 +67,6 @@ struct ftdm_isdn_data {
 	int32_t mode;
 	int32_t digit_timeout;
 	ftdm_isdn_opts_t opts;
-	ftdm_caller_data_t *outbound_crv[32768];
-	ftdm_channel_t *channels_local_crv[32768];
-	ftdm_channel_t *channels_remote_crv[32768];
 #ifdef HAVE_PCAP
 	struct pcap_context *pcap;
 #endif