diff --git a/src/dosbox.cpp b/src/dosbox.cpp
index 69339d54..b3de0567 100644
--- a/src/dosbox.cpp
+++ b/src/dosbox.cpp
@@ -768,6 +768,9 @@ void DOSBOX_Init(void) {
 	Pstring = Pmulti_remain->GetSection()->Add_string("parameters",Property::Changeable::WhenIdle,"");
 	Pmulti_remain->Set_help("see serial1");
 
+	Pstring = secprop->Add_path("phonebookfile", Property::Changeable::OnlyAtStart, "phonebook-" VERSION ".txt");
+	Pstring->Set_help("File used to map fake phone numbers to addresses.");
+
 
 	/* All the DOS Related stuff, which will eventually start up in the shell */
 	secprop=control->AddSection_prop("dos",&DOS_Init,false);//done
diff --git a/src/hardware/serialport/serialport.cpp b/src/hardware/serialport/serialport.cpp
index 977f8704..5d7df467 100644
--- a/src/hardware/serialport/serialport.cpp
+++ b/src/hardware/serialport/serialport.cpp
@@ -1214,8 +1214,7 @@ bool CSerial::Putchar(Bit8u data, bool wait_dsr, bool wait_cts, Bitu timeout) {
 
 #if SERIAL_DEBUG
 	log_ser(dbg_aux,"Putchar 0x%x",data);
-#endif
-
+#endif 
 	return true;
 }
 
@@ -1225,6 +1224,11 @@ public:
 		Bit16u biosParameter[4] = { 0, 0, 0, 0 };
 		Section_prop *section = static_cast <Section_prop*>(configuration);
 
+#if C_MODEM
+		const Prop_path *pbFilename = section->Get_path("phonebookfile");
+		MODEM_ReadPhonebook(pbFilename->realpath);
+#endif
+
 		char s_property[] = "serialx"; 
 		for(Bitu i = 0; i < 4; i++) {
 			// get the configuration property
diff --git a/src/hardware/serialport/softmodem.cpp b/src/hardware/serialport/softmodem.cpp
index 665c99bf..8ed4262e 100644
--- a/src/hardware/serialport/softmodem.cpp
+++ b/src/hardware/serialport/softmodem.cpp
@@ -23,12 +23,85 @@
 #include <stdlib.h>
 #include <string.h>
 #include <utility>
+#include <fstream>
+#include <sstream>
 
 #include "support.h"
 #include "serialport.h"
 #include "softmodem.h"
 #include "misc_util.h"
 
+class PhonebookEntry {
+public:
+	PhonebookEntry(const std::string &_phone, const std::string &_address) :
+		phone(_phone),
+		address(_address) {
+	}
+
+	bool IsMatchingPhone(const std::string &input) const {
+		return (input == phone);
+	}
+
+	const std::string &GetAddress() const {
+		return address;
+	}
+
+private:
+	std::string phone;
+	std::string address;
+};
+
+static std::vector<PhonebookEntry *> phones;
+static const char phoneValidChars[] = "01234567890*=,;#+>";
+
+static bool MODEM_IsPhoneValid(const std::string &input) {
+	size_t found = input.find_first_not_of(phoneValidChars);
+	if (found != std::string::npos) {
+		LOG_MSG("SERIAL: Phone %s contains invalid character %c", input.c_str(), input[found]);
+		return false;
+	}
+
+	return true;
+}
+
+bool MODEM_ReadPhonebook(const std::string &filename) {
+	std::ifstream loadfile(filename);
+	if (!loadfile)
+		return false;
+
+	LOG_MSG("SERIAL: Loading phonebook from %s", filename.c_str());
+
+	std::string linein;
+	while (std::getline(loadfile, linein)) {
+		std::istringstream iss(linein);
+		std::string phone, address;
+
+		if (!(iss >> phone >> address)) {
+			LOG_MSG("SERIAL: Skipped a bad line in %s", filename.c_str());
+			continue;
+		}
+
+		// Check phone number for characters ignored by Hayes modems.
+		if (!MODEM_IsPhoneValid(phone))
+			continue;
+
+		LOG_MSG("SERIAL: Mapped phone %s to address %s", phone.c_str(), address.c_str());
+		PhonebookEntry *pbEntry = new PhonebookEntry(phone, address);
+		phones.push_back(pbEntry);
+	}
+
+	return true;
+}
+
+static const char *MODEM_GetAddressFromPhone(const char *input) {
+	for (const auto entry : phones) {
+		if (entry->IsMatchingPhone(input))
+			return entry->GetAddress().c_str();
+	}
+
+	return nullptr;
+}
+
 CSerialModem::CSerialModem(Bitu id, CommandLine* cmd)
 	: CSerial(id, cmd),
 	  rqueue(new CFifo(MODEM_BUFFER_QUEUE_SIZE)),
@@ -187,21 +260,26 @@ void CSerialModem::SendRes(const ResTypes response) {
 	}
 }
 
-bool CSerialModem::Dial(char * host) {
+bool CSerialModem::Dial(const char * host) {
+	char buf[128] = "";
+	safe_strcpy(buf, host);
+
+	const char *destination = buf;
 
 	// Scan host for port
 	Bit16u port;
-	char * hasport = strrchr(host,':');
+	char * hasport = strrchr(buf,':');
 	if (hasport) {
 		*hasport++ = 0;
 		port = (Bit16u)atoi(hasport);
 	}
-	else
+	else {
 		port = MODEM_DEFAULT_PORT;
+	}
 
 	// Resolve host we're gonna dial
-	LOG_MSG("Connecting to host %s port %u", host, port);
-	clientsocket.reset(new TCPClientSocket(host, port));
+	LOG_MSG("Connecting to host %s port %u", destination, port);
+	clientsocket.reset(new TCPClientSocket(destination, port));
 	if (!clientsocket->isopen) {
 		clientsocket.reset(nullptr);
 		LOG_MSG("Failed to connect.");
@@ -381,6 +459,12 @@ void CSerialModem::DoCommand() {
 				helper--;
 			}
 
+			const char *mappedaddr = MODEM_GetAddressFromPhone(foundstr);
+			if (mappedaddr) {
+				Dial(mappedaddr);
+				return;
+			}
+
 			//Large enough scope, so the buffers are still valid when reaching Dail.
 			char buffer[128];
 			char obuffer[128];
diff --git a/src/hardware/serialport/softmodem.h b/src/hardware/serialport/softmodem.h
index 8741b05f..6a73cf77 100644
--- a/src/hardware/serialport/softmodem.h
+++ b/src/hardware/serialport/softmodem.h
@@ -57,6 +57,8 @@ enum ResTypes {
 #define TEL_CLIENT 0
 #define TEL_SERVER 1
 
+bool MODEM_ReadPhonebook(const std::string &filename);
+
 class CFifo {
 public:
 	CFifo(Bitu _size)
@@ -181,9 +183,7 @@ public:
 
 	void EnterIdleState();
 	void EnterConnectedState();
-
-	void openConnection(void);
-	bool Dial(char * host);
+	bool Dial(const char *host);
 	void AcceptIncomingCall(void);
 	Bitu ScanNumber(char * & scan) const;
 	char GetChar(char * & scan) const;