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diff --git a/libraries/GSM/GSM3MobileVoiceProvider.h b/libraries/GSM/GSM3MobileVoiceProvider.h
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+++ b/libraries/GSM/GSM3MobileVoiceProvider.h
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+/*
+This file is part of the GSM3 communications library for Arduino
+-- Multi-transport communications platform
+-- Fully asynchronous
+-- Includes code for the Arduino-Telefonica GSM/GPRS Shield V1
+-- Voice calls
+-- SMS
+-- TCP/IP connections
+-- HTTP basic clients
+
+This library has been developed by Telefónica Digital - PDI -
+- Physical Internet Lab, as part as its collaboration with
+Arduino and the Open Hardware Community. 
+
+September-December 2012
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+The latest version of this library can always be found at
+https://github.com/BlueVia/Official-Arduino
+*/
+#ifndef _GSM3MOBILEVOICEPROVIDER_
+#define _GSM3MOBILEVOICEPROVIDER_
+
+enum GSM3_voiceCall_st { IDLE_CALL, CALLING, RECEIVINGCALL, TALKING};
+
+class GSM3MobileVoiceProvider
+{
+	public:
+		
+		/** Initialize the object relating it to the general infrastructure
+			@param
+			@return void
+		*/
+		virtual void initialize(){};
+		
+		/** Launch a voice call
+			@param number	 	Phone number to be called
+			@return If asynchronous, returns 0. If synchronous, 1 if success, other if error
+		*/
+		virtual int voiceCall(const char* number)=0;
+		
+		/** Answer a voice call
+			@return If asynchronous, returns 0. If synchronous, 1 if success, other if error
+		*/
+		virtual int answerCall()=0;
+		
+		/** Hang a voice call
+			@return If asynchronous, returns 0. If synchronous, 1 if success, other if error
+		*/
+		virtual int hangCall()=0;
+		
+		/** Retrieve phone number of caller
+			@param buffer		Buffer for copy phone number
+			@param bufsize		Buffer size
+			@return If asynchronous, returns 0. If synchronous, 1 if success, other if error
+		*/
+		virtual int retrieveCallingNumber(char* buffer, int bufsize)=0;
+
+		/** Returns voice call status
+			@return voice call status
+		*/
+		virtual GSM3_voiceCall_st getvoiceCallStatus()=0;
+		
+		/**	Set voice call status
+			@param status		New status for voice call
+		*/
+		virtual void setvoiceCallStatus(GSM3_voiceCall_st status)=0;
+
+		/** Get last command status
+			@return Returns 0 if last command is still executing, 1 success, >1 error
+		*/
+		virtual int ready()=0;
+};
+
+extern GSM3MobileVoiceProvider* theGSM3MobileVoiceProvider;
+
+#endif