Merged revisions 310636 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r310636 | rmudgett | 2011-03-14 11:50:59 -0500 (Mon, 14 Mar 2011) | 39 lines
  
  Merged revisions 310635 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r310635 | rmudgett | 2011-03-14 11:47:54 -0500 (Mon, 14 Mar 2011) | 32 lines
    
    Merged revisions 310633 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
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      r310633 | rmudgett | 2011-03-14 11:38:24 -0500 (Mon, 14 Mar 2011) | 25 lines
      
      "Caller*ID failed checksum" on Wildcard TDM2400P and TDM410
      
      The last character in the caller id message is getting a framing error.
      
      The checksum is the last character in the message.  A framing error in the
      checksum could be because:
      1) The sender did not send a full stop bit.
      2) The sender cut off the FSK carrier too soon.
      3) The sender opted to send zero of the specified zero to 10 trailing mark
      bits and round-off errors in the code resulted in the code not being where
      it thought it was in the demodulated bit stream.
      
      Bit 8 of 'b' is set when parity error.
      Bit 9 of 'b' is set when framing error.
      
      Made ignore the framing and parity error bits if the errored character is
      the checksum.  We can tolerate a framing/parity error there.  The checksum
      character validates the message.
      
      (closes issue #18474)
      Reported by: nivek
      Patches:
            callerid.c.1.patch uploaded by nivek (license 636) (with modifications)
      Tested by: nivek
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@310637 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/callerid.c

@@ -568,9 +568,22 @@ int callerid_feed(struct callerid_state *cid, unsigned char *ubuf, int len, stru
 			return -1;
 		}
 		if (res == 1) {
-			/* Ignore invalid bytes */
-			if (b > 0xff)
-				continue;
+			if (b > 0xff) {
+				if (cid->sawflag != 5) {
+					/* Ignore invalid bytes */
+					continue;
+				}
+				/*
+				 * We can tollerate an error on the checksum character since the
+				 * checksum character is the last character in the message and
+				 * it validates the message.
+				 *
+				 * Remove character error flags.
+				 * Bit 8 : Parity error
+				 * Bit 9 : Framing error
+				 */
+				b &= 0xff;
+			}
 			switch (cid->sawflag) {
 			case 0: /* Look for flag */
 				if (b == 'U')