FS-7780 add new channel variable max_session_transfers. If set, this variable is used to count

the number of session transfers allowed instead of the max_forwards variable.  If not set, the existing
behavior is preserved.

src/include/switch_types.h

 /* 
  * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
- * Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
+ * Copyright (C) 2005-2015, Anthony Minessale II <anthm@freeswitch.org>
  *
  * Version: MPL 1.1
  *
@@ -219,6 +219,7 @@ SWITCH_BEGIN_EXTERN_C
 #define SWITCH_EXEC_AFTER_BRIDGE_APP_VARIABLE "exec_after_bridge_app"
 #define SWITCH_EXEC_AFTER_BRIDGE_ARG_VARIABLE "exec_after_bridge_arg"
 #define SWITCH_MAX_FORWARDS_VARIABLE "max_forwards"
+#define SWITCH_MAX_SESSION_TRANSFERS_VARIABLE "max_session_transfers"
 #define SWITCH_DISABLE_APP_LOG_VARIABLE "disable_app_log"
 #define SWITCH_SPEECH_KEY "speech"
 #define SWITCH_UUID_BRIDGE "uuid_bridge"

src/switch_ivr.c

@@ -1756,10 +1756,15 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_session_transfer(switch_core_session_
 	switch_channel_t *other_channel = NULL;
 	const char *uuid = NULL;
 	const char *max_forwards;
-	const char *forwardvar = switch_channel_get_variable(channel, SWITCH_MAX_FORWARDS_VARIABLE);
+	const char *forwardvar_name = SWITCH_MAX_SESSION_TRANSFERS_VARIABLE; /* max_session_transfers has first priority for setting maximum */
+	const char *forwardvar = switch_channel_get_variable(channel, forwardvar_name);
 	int forwardval = 70;
 	const char *use_dialplan = dialplan, *use_context = context;
 
+	if (zstr(forwardvar)) {
+		forwardvar_name = SWITCH_MAX_FORWARDS_VARIABLE; /* fall back to max_forwards variable for setting maximum */
+		forwardvar = switch_channel_get_variable(channel, forwardvar_name);
+	}
 	if (!zstr(forwardvar)) {
 		forwardval = atoi(forwardvar) - 1;
 	}
@@ -1769,7 +1774,7 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_session_transfer(switch_core_session_
 	}
 
 	max_forwards = switch_core_session_sprintf(session, "%d", forwardval);
-	switch_channel_set_variable(channel, SWITCH_MAX_FORWARDS_VARIABLE, max_forwards);
+	switch_channel_set_variable(channel, forwardvar_name, max_forwards);
 
 	switch_core_session_reset(session, SWITCH_TRUE, SWITCH_TRUE);
 	switch_channel_clear_flag(channel, CF_ORIGINATING);