diff --git a/src/network/net_modem.c b/src/network/net_modem.c
index fe8ebfc57..c7d0aea2c 100644
--- a/src/network/net_modem.c
+++ b/src/network/net_modem.c
@@ -153,6 +153,7 @@ static modem_t *instance;
 #define MREG_DTR_DELAY 25
 
 static void modem_do_command(modem_t* modem);
+static void modem_accept_incoming_call(modem_t* modem);
 
 extern ssize_t local_getline(char **buf, size_t *bufsiz, FILE *fp);
 
@@ -558,7 +559,6 @@ modem_reset(modem_t* modem)
 void
 modem_dial(modem_t* modem, const char* str)
 {
-    /* TODO: Port TCP/IP support from DOSBox. */
     modem->tcpIpConnCounter = 0;
     modem->tcpIpMode = false;
     if (!strncmp(str, "0.0.0.0", sizeof("0.0.0.0") - 1))
@@ -822,8 +822,12 @@ modem_do_command(modem_t* modem)
                 break;
             case 'A': // Answer call
                 {
-                    modem_send_res(modem, ResERROR);
-                    return;
+                    if (modem->waitingclientsocket == -1) {
+                        modem_send_res(modem, ResERROR);
+                        return;
+                    }
+                    modem_accept_incoming_call(modem);
+                    break;
                 }
                 return;
             case 'Z': { // Reset and load profiles
diff --git a/src/unix/unix_netsocket.c b/src/unix/unix_netsocket.c
index 9e9ac2f49..e6ec6285f 100644
--- a/src/unix/unix_netsocket.c
+++ b/src/unix/unix_netsocket.c
@@ -144,7 +144,7 @@ int plat_netsocket_connect(SOCKET socket, const char* hostname, unsigned short p
     sock_addr.sin_addr.s_addr = inet_addr(hostname);
     sock_addr.sin_port = htons(port);
 
-    if (sock_addr.sin_addr.s_addr == INADDR_ANY || sock_addr.sin_addr.s_addr == 0) {
+    if (sock_addr.sin_addr.s_addr == ((in_addr_t)-1) || sock_addr.sin_addr.s_addr == 0) {
         struct hostent *hp;
 
         hp = gethostbyname(hostname);