diff --git a/README b/README
index 8d18d3a..b17029b 100644
--- a/README
+++ b/README
@@ -77,9 +77,10 @@ The Dial string
   The string consists of a list of characters with the following meaning:
    'b' : early B3 always.
    'B' : early B3 on successful calls only.
-   'o' : use overlap sending of number if number is longer than 2 digits
-         (This is useful, when further digits shall be send to complete the
-	 destination address).
+   'o' : use overlap sending of number.
+         (Useful if additional digits shall be send afterwards or together
+          with 'b' to get dialtone and then send the number, e.g. if otherwise
+          no progress tones are available)
 
   If the <interface-name> is used in dialstring, be sure the name (specified
   in capi.conf) does not start with 'contr' or 'g'.
diff --git a/chan_capi.c b/chan_capi.c
index 12d9047..5f61b36 100644
--- a/chan_capi.c
+++ b/chan_capi.c
@@ -938,9 +938,9 @@ static int capi_call(struct ast_channel *c, char *idest, int timeout)
 #else
 	CONNECT_REQ_CIPVALUE(&CMSG) = 0x10; /* Telephony */
 #endif
-	if ((i->doOverlap) && (strlen(dest) > 2)) {
-		strncpy(i->overlapdigits, dest + 2, sizeof(i->overlapdigits) - 1);
-		called[0] = 3;
+	if ((i->doOverlap) && (strlen(dest))) {
+		strncpy(i->overlapdigits, dest, sizeof(i->overlapdigits) - 1);
+		called[0] = 1;
 	} else {
 		called[0] = strlen(dest) + 1;
 	}