diff --git a/libs/freetdm/src/include/private/ftdm_call_utils.h b/libs/freetdm/src/include/private/ftdm_call_utils.h
new file mode 100644
index 0000000000..57f2f4b133
--- /dev/null
+++ b/libs/freetdm/src/include/private/ftdm_call_utils.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2010, Sangoma Technologies
+ * David Yat Sin <dyatsin@sangoma.com>
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 
+ * * Neither the name of the original author; nor the names of any contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __FTDM_CALL_UTILS_H__
+#define __FTDM_CALL_UTILS_H__
+
+#include "freetdm.h"
+
+FT_DECLARE(ftdm_status_t) ftdm_span_set_npi(const char *npi_string, uint8_t *target);
+FT_DECLARE(ftdm_status_t) ftdm_span_set_ton(const char *ton_string, uint8_t *target);
+FT_DECLARE(ftdm_status_t) ftdm_is_number(char *number);
+
+#endif /* __FTDM_CALL_UTILS_H__ */
+